diff --git a/cmd/cart/pool-server.go b/cmd/cart/pool-server.go
index f32940f..7d00110 100644
--- a/cmd/cart/pool-server.go
+++ b/cmd/cart/pool-server.go
@@ -792,7 +792,18 @@ func (s *PoolServer) Serve(mux *http.ServeMux) {
 				http.Error(w, "Invalid HMAC", http.StatusUnauthorized)
 				return
 			} else {
+
+				cartId, ok := cart.ParseCartId(notification.OriginalReference)
 				log.Printf("Recieved notification event code: %s, %v", notification.EventCode, notification)
+				if ok {
+					host, ok := s.OwnerHost(uint64(cartId))
+					if ok {
+						log.Printf("Not owner of %d, owner: %s", cartId, host.Name())
+						//host.Apply(r.Context(), cartId)
+					} else {
+						log.Printf("I'm the owner of %d", cartId)
+					}
+				}
 			}
 		}
 		w.WriteHeader(http.StatusAccepted)
diff --git a/pkg/actor/grain_pool.go b/pkg/actor/grain_pool.go
index f51c220..221a2e1 100644
--- a/pkg/actor/grain_pool.go
+++ b/pkg/actor/grain_pool.go
@@ -35,6 +35,7 @@ type Host interface {
 	Negotiate(otherHosts []string) ([]string, error)
 	Name() string
 	Proxy(id uint64, w http.ResponseWriter, r *http.Request) (bool, error)
+	Apply(ctx context.Context, id uint64, mutation ...proto.Message) (bool, error)
 	GetActorIds() []uint64
 	Close() error
 	Ping() bool
diff --git a/pkg/actor/grpc_server.go b/pkg/actor/grpc_server.go
index 03fc928..01a2152 100644
--- a/pkg/actor/grpc_server.go
+++ b/pkg/actor/grpc_server.go
@@ -8,6 +8,7 @@ import (
 	"time"
 
 	messages "git.k6n.net/go-cart-actor/pkg/messages"
+	"github.com/gogo/protobuf/proto"
 	"go.opentelemetry.io/contrib/bridges/otelslog"
 	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/attribute"
@@ -139,6 +140,69 @@ func (s *ControlServer[V]) Ping(ctx context.Context, _ *messages.Empty) (*messag
 	}, nil
 }
 
+func (s *ControlServer[V]) Apply(ctx context.Context, in *messages.ApplyRequest) (*messages.ApplyResult, error) {
+	msgs := make([]proto.Message, len(in.Messages))
+	for i, mut := range in.Messages {
+		var msg proto.Message
+		if m := mut.GetClearCart(); m != nil {
+			msg = m
+		} else if m := mut.GetAddItem(); m != nil {
+			msg = m
+		} else if m := mut.GetRemoveItem(); m != nil {
+			msg = m
+		} else if m := mut.GetChangeQuantity(); m != nil {
+			msg = m
+		} else if m := mut.GetSetDelivery(); m != nil {
+			msg = m
+		} else if m := mut.GetSetPickupPoint(); m != nil {
+			msg = m
+		} else if m := mut.GetRemoveDelivery(); m != nil {
+			msg = m
+		} else if m := mut.GetSetUserId(); m != nil {
+			msg = m
+		} else if m := mut.GetLineItemMarking(); m != nil {
+			msg = m
+		} else if m := mut.GetRemoveLineItemMarking(); m != nil {
+			msg = m
+		} else if m := mut.GetSubscriptionAdded(); m != nil {
+			msg = m
+		} else if m := mut.GetPaymentDeclined(); m != nil {
+			msg = m
+		} else if m := mut.GetConfirmationViewed(); m != nil {
+			msg = m
+		} else if m := mut.GetCreateCheckoutOrder(); m != nil {
+			msg = m
+		} else if m := mut.GetOrderCreated(); m != nil {
+			msg = m
+		} else if m := mut.GetNoop(); m != nil {
+			msg = m
+		} else if m := mut.GetInitializeCheckout(); m != nil {
+			msg = m
+		} else if m := mut.GetInventoryReserved(); m != nil {
+			msg = m
+		} else if m := mut.GetAddVoucher(); m != nil {
+			msg = m
+		} else if m := mut.GetRemoveVoucher(); m != nil {
+			msg = m
+		} else if m := mut.GetUpsertSubscriptionDetails(); m != nil {
+			msg = m
+		} else if m := mut.GetPreConditionFailed(); m != nil {
+			msg = m
+		} else if m := mut.GetAddGiftcard(); m != nil {
+			msg = m
+		} else if m := mut.GetRemoveGiftcard(); m != nil {
+			msg = m
+		}
+		msgs[i] = msg
+	}
+	_, err := s.pool.Apply(ctx, in.Id, msgs...)
+	if err != nil {
+		return &messages.ApplyResult{Accepted: false}, err
+	}
+
+	return &messages.ApplyResult{Accepted: true}, nil
+}
+
 // ControlPlane: Negotiate (merge host views)
 func (s *ControlServer[V]) Negotiate(ctx context.Context, req *messages.NegotiateRequest) (*messages.NegotiateReply, error) {
 	ctx, span := tracer.Start(ctx, "grpc_negotiate")
diff --git a/pkg/actor/mutation_registry.go b/pkg/actor/mutation_registry.go
index 41f7798..a53e98d 100644
--- a/pkg/actor/mutation_registry.go
+++ b/pkg/actor/mutation_registry.go
@@ -212,9 +212,9 @@ func (r *ProtoMutationRegistry) Apply(ctx context.Context, grain any, msg ...pro
 	}
 
 	for _, m := range msg {
-		// Ignore nil mutation elements (untyped or typed nil pointers) silently; they carry no data.
+		// Error if any mutation element is nil.
 		if m == nil {
-			continue
+			return results, fmt.Errorf("nil mutation message")
 		}
 		// Typed nil: interface holds concrete proto message type whose pointer value is nil.
 		rv := reflect.ValueOf(m)
@@ -251,6 +251,12 @@ func (r *ProtoMutationRegistry) Apply(ctx context.Context, grain any, msg ...pro
 			}
 		}
 	}
+	// Return error for unregistered mutations
+	for _, res := range results {
+		if res.Error == ErrMutationNotRegistered {
+			return results, res.Error
+		}
+	}
 	return results, nil
 }
 
diff --git a/pkg/actor/mutation_registry_test.go b/pkg/actor/mutation_registry_test.go
index 623070e..911b86a 100644
--- a/pkg/actor/mutation_registry_test.go
+++ b/pkg/actor/mutation_registry_test.go
@@ -2,7 +2,6 @@ package actor
 
 import (
 	"context"
-	"errors"
 	"reflect"
 	"slices"
 	"testing"
@@ -90,7 +89,7 @@ func TestRegisteredMutationBasics(t *testing.T) {
 	}
 
 	// Apply nil grain
-	if _, err := reg.Apply(nil, add); err == nil {
+	if _, err := reg.Apply(context.Background(), nil, add); err == nil {
 		t.Fatalf("expected error for nil grain")
 	}
 
@@ -100,7 +99,8 @@ func TestRegisteredMutationBasics(t *testing.T) {
 	}
 
 	// Apply unregistered message
-	if _, err := reg.Apply(context.Background(), state, &messages.Noop{}); !errors.Is(err, ErrMutationNotRegistered) {
+	_, err := reg.Apply(context.Background(), state, &messages.Noop{})
+	if err != ErrMutationNotRegistered {
 		t.Fatalf("expected ErrMutationNotRegistered, got %v", err)
 	}
 }
diff --git a/pkg/cart/mutation_test.go b/pkg/cart/mutation_test.go
index d1d0c9c..1a9ccfc 100644
--- a/pkg/cart/mutation_test.go
+++ b/pkg/cart/mutation_test.go
@@ -267,10 +267,10 @@ func TestMutationRegistryCoverage(t *testing.T) {
 		t.Fatalf("GetTypeName failed for AddItem, got (%q,%v)", nm, ok)
 	}
 
-	// Apply unregistered message -> result should contain ErrMutationNotRegistered, no top-level error
+	// Apply unregistered message -> should return error
 	results, err := reg.Apply(context.Background(), newTestGrain(), &messages.Noop{})
-	if err != nil {
-		t.Fatalf("unexpected top-level error applying unregistered mutation: %v", err)
+	if err == nil {
+		t.Fatalf("expected error for unregistered mutation")
 	}
 	if len(results) != 1 || results[0].Error == nil || results[0].Error != actor.ErrMutationNotRegistered {
 		t.Fatalf("expected ApplyResult with ErrMutationNotRegistered, got %#v", results)
diff --git a/pkg/messages/control_plane.pb.go b/pkg/messages/control_plane.pb.go
index 60d3553..d474c27 100644
--- a/pkg/messages/control_plane.pb.go
+++ b/pkg/messages/control_plane.pb.go
@@ -451,11 +451,108 @@ func (x *ExpiryAnnounce) GetIds() []uint64 {
 	return nil
 }
 
+type ApplyRequest struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Id            uint64                 `protobuf:"varint,1,opt,name=id,proto3" json:"id,omitempty"`
+	Messages      []*Mutation            `protobuf:"bytes,2,rep,name=messages,proto3" json:"messages,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *ApplyRequest) Reset() {
+	*x = ApplyRequest{}
+	mi := &file_control_plane_proto_msgTypes[9]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *ApplyRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ApplyRequest) ProtoMessage() {}
+
+func (x *ApplyRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_control_plane_proto_msgTypes[9]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ApplyRequest.ProtoReflect.Descriptor instead.
+func (*ApplyRequest) Descriptor() ([]byte, []int) {
+	return file_control_plane_proto_rawDescGZIP(), []int{9}
+}
+
+func (x *ApplyRequest) GetId() uint64 {
+	if x != nil {
+		return x.Id
+	}
+	return 0
+}
+
+func (x *ApplyRequest) GetMessages() []*Mutation {
+	if x != nil {
+		return x.Messages
+	}
+	return nil
+}
+
+type ApplyResult struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Accepted      bool                   `protobuf:"varint,1,opt,name=accepted,proto3" json:"accepted,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *ApplyResult) Reset() {
+	*x = ApplyResult{}
+	mi := &file_control_plane_proto_msgTypes[10]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *ApplyResult) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ApplyResult) ProtoMessage() {}
+
+func (x *ApplyResult) ProtoReflect() protoreflect.Message {
+	mi := &file_control_plane_proto_msgTypes[10]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use ApplyResult.ProtoReflect.Descriptor instead.
+func (*ApplyResult) Descriptor() ([]byte, []int) {
+	return file_control_plane_proto_rawDescGZIP(), []int{10}
+}
+
+func (x *ApplyResult) GetAccepted() bool {
+	if x != nil {
+		return x.Accepted
+	}
+	return false
+}
+
 var File_control_plane_proto protoreflect.FileDescriptor
 
 var file_control_plane_proto_rawDesc = string([]byte{
 	0x0a, 0x13, 0x63, 0x6f, 0x6e, 0x74, 0x72, 0x6f, 0x6c, 0x5f, 0x70, 0x6c, 0x61, 0x6e, 0x65, 0x2e,
-	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x08, 0x6d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x73, 0x22,
+	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x08, 0x6d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x73, 0x1a,
+	0x0e, 0x6d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x73, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x22,
 	0x07, 0x0a, 0x05, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x22, 0x3c, 0x0a, 0x09, 0x50, 0x69, 0x6e, 0x67,
 	0x52, 0x65, 0x70, 0x6c, 0x79, 0x12, 0x12, 0x0a, 0x04, 0x68, 0x6f, 0x73, 0x74, 0x18, 0x01, 0x20,
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@@ -482,35 +579,46 @@ var file_control_plane_proto_rawDesc = string([]byte{
 	0x0a, 0x0e, 0x45, 0x78, 0x70, 0x69, 0x72, 0x79, 0x41, 0x6e, 0x6e, 0x6f, 0x75, 0x6e, 0x63, 0x65,
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+	0x70, 0x6c, 0x79, 0x12, 0x3c, 0x0a, 0x10, 0x47, 0x65, 0x74, 0x4c, 0x6f, 0x63, 0x61, 0x6c, 0x41,
+	0x63, 0x74, 0x6f, 0x72, 0x49, 0x64, 0x73, 0x12, 0x0f, 0x2e, 0x6d, 0x65, 0x73, 0x73, 0x61, 0x67,
+	0x65, 0x73, 0x2e, 0x45, 0x6d, 0x70, 0x74, 0x79, 0x1a, 0x17, 0x2e, 0x6d, 0x65, 0x73, 0x73, 0x61,
+	0x67, 0x65, 0x73, 0x2e, 0x41, 0x63, 0x74, 0x6f, 0x72, 0x49, 0x64, 0x73, 0x52, 0x65, 0x70, 0x6c,
+	0x79, 0x12, 0x4a, 0x0a, 0x11, 0x41, 0x6e, 0x6e, 0x6f, 0x75, 0x6e, 0x63, 0x65, 0x4f, 0x77, 0x6e,
+	0x65, 0x72, 0x73, 0x68, 0x69, 0x70, 0x12, 0x1b, 0x2e, 0x6d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65,
+	0x73, 0x2e, 0x4f, 0x77, 0x6e, 0x65, 0x72, 0x73, 0x68, 0x69, 0x70, 0x41, 0x6e, 0x6e, 0x6f, 0x75,
+	0x6e, 0x63, 0x65, 0x1a, 0x18, 0x2e, 0x6d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x73, 0x2e, 0x4f,
+	0x77, 0x6e, 0x65, 0x72, 0x43, 0x68, 0x61, 0x6e, 0x67, 0x65, 0x41, 0x63, 0x6b, 0x12, 0x36, 0x0a,
+	0x05, 0x41, 0x70, 0x70, 0x6c, 0x79, 0x12, 0x16, 0x2e, 0x6d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65,
+	0x73, 0x2e, 0x41, 0x70, 0x70, 0x6c, 0x79, 0x52, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x1a, 0x15,
+	0x2e, 0x6d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x73, 0x2e, 0x41, 0x70, 0x70, 0x6c, 0x79, 0x52,
+	0x65, 0x73, 0x75, 0x6c, 0x74, 0x12, 0x44, 0x0a, 0x0e, 0x41, 0x6e, 0x6e, 0x6f, 0x75, 0x6e, 0x63,
+	0x65, 0x45, 0x78, 0x70, 0x69, 0x72, 0x79, 0x12, 0x18, 0x2e, 0x6d, 0x65, 0x73, 0x73, 0x61, 0x67,
+	0x65, 0x73, 0x2e, 0x45, 0x78, 0x70, 0x69, 0x72, 0x79, 0x41, 0x6e, 0x6e, 0x6f, 0x75, 0x6e, 0x63,
+	0x65, 0x1a, 0x18, 0x2e, 0x6d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x73, 0x2e, 0x4f, 0x77, 0x6e,
+	0x65, 0x72, 0x43, 0x68, 0x61, 0x6e, 0x67, 0x65, 0x41, 0x63, 0x6b, 0x12, 0x3c, 0x0a, 0x07, 0x43,
+	0x6c, 0x6f, 0x73, 0x69, 0x6e, 0x67, 0x12, 0x17, 0x2e, 0x6d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65,
+	0x73, 0x2e, 0x43, 0x6c, 0x6f, 0x73, 0x69, 0x6e, 0x67, 0x4e, 0x6f, 0x74, 0x69, 0x63, 0x65, 0x1a,
+	0x18, 0x2e, 0x6d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x73, 0x2e, 0x4f, 0x77, 0x6e, 0x65, 0x72,
+	0x43, 0x68, 0x61, 0x6e, 0x67, 0x65, 0x41, 0x63, 0x6b, 0x42, 0x2a, 0x5a, 0x28, 0x67, 0x69, 0x74,
+	0x2e, 0x6b, 0x36, 0x6e, 0x2e, 0x6e, 0x65, 0x74, 0x2f, 0x67, 0x6f, 0x2d, 0x63, 0x61, 0x72, 0x74,
+	0x2d, 0x61, 0x63, 0x74, 0x6f, 0x72, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x3b, 0x6d, 0x65, 0x73,
+	0x73, 0x61, 0x67, 0x65, 0x73, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 })
 
 var (
@@ -525,7 +633,7 @@ func file_control_plane_proto_rawDescGZIP() []byte {
 	return file_control_plane_proto_rawDescData
 }
 
-var file_control_plane_proto_msgTypes = make([]protoimpl.MessageInfo, 9)
+var file_control_plane_proto_msgTypes = make([]protoimpl.MessageInfo, 11)
 var file_control_plane_proto_goTypes = []any{
 	(*Empty)(nil),             // 0: messages.Empty
 	(*PingReply)(nil),         // 1: messages.PingReply
@@ -536,25 +644,31 @@ var file_control_plane_proto_goTypes = []any{
 	(*ClosingNotice)(nil),     // 6: messages.ClosingNotice
 	(*OwnershipAnnounce)(nil), // 7: messages.OwnershipAnnounce
 	(*ExpiryAnnounce)(nil),    // 8: messages.ExpiryAnnounce
+	(*ApplyRequest)(nil),      // 9: messages.ApplyRequest
+	(*ApplyResult)(nil),       // 10: messages.ApplyResult
+	(*Mutation)(nil),          // 11: messages.Mutation
 }
 var file_control_plane_proto_depIdxs = []int32{
-	0, // 0: messages.ControlPlane.Ping:input_type -> messages.Empty
-	2, // 1: messages.ControlPlane.Negotiate:input_type -> messages.NegotiateRequest
-	0, // 2: messages.ControlPlane.GetLocalActorIds:input_type -> messages.Empty
-	7, // 3: messages.ControlPlane.AnnounceOwnership:input_type -> messages.OwnershipAnnounce
-	8, // 4: messages.ControlPlane.AnnounceExpiry:input_type -> messages.ExpiryAnnounce
-	6, // 5: messages.ControlPlane.Closing:input_type -> messages.ClosingNotice
-	1, // 6: messages.ControlPlane.Ping:output_type -> messages.PingReply
-	3, // 7: messages.ControlPlane.Negotiate:output_type -> messages.NegotiateReply
-	4, // 8: messages.ControlPlane.GetLocalActorIds:output_type -> messages.ActorIdsReply
-	5, // 9: messages.ControlPlane.AnnounceOwnership:output_type -> messages.OwnerChangeAck
-	5, // 10: messages.ControlPlane.AnnounceExpiry:output_type -> messages.OwnerChangeAck
-	5, // 11: messages.ControlPlane.Closing:output_type -> messages.OwnerChangeAck
-	6, // [6:12] is the sub-list for method output_type
-	0, // [0:6] is the sub-list for method input_type
-	0, // [0:0] is the sub-list for extension type_name
-	0, // [0:0] is the sub-list for extension extendee
-	0, // [0:0] is the sub-list for field type_name
+	11, // 0: messages.ApplyRequest.messages:type_name -> messages.Mutation
+	0,  // 1: messages.ControlPlane.Ping:input_type -> messages.Empty
+	2,  // 2: messages.ControlPlane.Negotiate:input_type -> messages.NegotiateRequest
+	0,  // 3: messages.ControlPlane.GetLocalActorIds:input_type -> messages.Empty
+	7,  // 4: messages.ControlPlane.AnnounceOwnership:input_type -> messages.OwnershipAnnounce
+	9,  // 5: messages.ControlPlane.Apply:input_type -> messages.ApplyRequest
+	8,  // 6: messages.ControlPlane.AnnounceExpiry:input_type -> messages.ExpiryAnnounce
+	6,  // 7: messages.ControlPlane.Closing:input_type -> messages.ClosingNotice
+	1,  // 8: messages.ControlPlane.Ping:output_type -> messages.PingReply
+	3,  // 9: messages.ControlPlane.Negotiate:output_type -> messages.NegotiateReply
+	4,  // 10: messages.ControlPlane.GetLocalActorIds:output_type -> messages.ActorIdsReply
+	5,  // 11: messages.ControlPlane.AnnounceOwnership:output_type -> messages.OwnerChangeAck
+	10, // 12: messages.ControlPlane.Apply:output_type -> messages.ApplyResult
+	5,  // 13: messages.ControlPlane.AnnounceExpiry:output_type -> messages.OwnerChangeAck
+	5,  // 14: messages.ControlPlane.Closing:output_type -> messages.OwnerChangeAck
+	8,  // [8:15] is the sub-list for method output_type
+	1,  // [1:8] is the sub-list for method input_type
+	1,  // [1:1] is the sub-list for extension type_name
+	1,  // [1:1] is the sub-list for extension extendee
+	0,  // [0:1] is the sub-list for field type_name
 }
 
 func init() { file_control_plane_proto_init() }
@@ -562,13 +676,14 @@ func file_control_plane_proto_init() {
 	if File_control_plane_proto != nil {
 		return
 	}
+	file_messages_proto_init()
 	type x struct{}
 	out := protoimpl.TypeBuilder{
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: unsafe.Slice(unsafe.StringData(file_control_plane_proto_rawDesc), len(file_control_plane_proto_rawDesc)),
 			NumEnums:      0,
-			NumMessages:   9,
+			NumMessages:   11,
 			NumExtensions: 0,
 			NumServices:   1,
 		},
diff --git a/pkg/messages/control_plane_grpc.pb.go b/pkg/messages/control_plane_grpc.pb.go
index c78a6a6..f328d33 100644
--- a/pkg/messages/control_plane_grpc.pb.go
+++ b/pkg/messages/control_plane_grpc.pb.go
@@ -23,6 +23,7 @@ const (
 	ControlPlane_Negotiate_FullMethodName         = "/messages.ControlPlane/Negotiate"
 	ControlPlane_GetLocalActorIds_FullMethodName  = "/messages.ControlPlane/GetLocalActorIds"
 	ControlPlane_AnnounceOwnership_FullMethodName = "/messages.ControlPlane/AnnounceOwnership"
+	ControlPlane_Apply_FullMethodName             = "/messages.ControlPlane/Apply"
 	ControlPlane_AnnounceExpiry_FullMethodName    = "/messages.ControlPlane/AnnounceExpiry"
 	ControlPlane_Closing_FullMethodName           = "/messages.ControlPlane/Closing"
 )
@@ -41,6 +42,7 @@ type ControlPlaneClient interface {
 	GetLocalActorIds(ctx context.Context, in *Empty, opts ...grpc.CallOption) (*ActorIdsReply, error)
 	// Ownership announcement: first-touch claim broadcast (idempotent; best-effort).
 	AnnounceOwnership(ctx context.Context, in *OwnershipAnnounce, opts ...grpc.CallOption) (*OwnerChangeAck, error)
+	Apply(ctx context.Context, in *ApplyRequest, opts ...grpc.CallOption) (*ApplyResult, error)
 	// Expiry announcement: drop remote ownership hints when local TTL expires.
 	AnnounceExpiry(ctx context.Context, in *ExpiryAnnounce, opts ...grpc.CallOption) (*OwnerChangeAck, error)
 	// Closing announces graceful shutdown so peers can proactively adjust.
@@ -95,6 +97,16 @@ func (c *controlPlaneClient) AnnounceOwnership(ctx context.Context, in *Ownershi
 	return out, nil
 }
 
+func (c *controlPlaneClient) Apply(ctx context.Context, in *ApplyRequest, opts ...grpc.CallOption) (*ApplyResult, error) {
+	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
+	out := new(ApplyResult)
+	err := c.cc.Invoke(ctx, ControlPlane_Apply_FullMethodName, in, out, cOpts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 func (c *controlPlaneClient) AnnounceExpiry(ctx context.Context, in *ExpiryAnnounce, opts ...grpc.CallOption) (*OwnerChangeAck, error) {
 	cOpts := append([]grpc.CallOption{grpc.StaticMethod()}, opts...)
 	out := new(OwnerChangeAck)
@@ -129,6 +141,7 @@ type ControlPlaneServer interface {
 	GetLocalActorIds(context.Context, *Empty) (*ActorIdsReply, error)
 	// Ownership announcement: first-touch claim broadcast (idempotent; best-effort).
 	AnnounceOwnership(context.Context, *OwnershipAnnounce) (*OwnerChangeAck, error)
+	Apply(context.Context, *ApplyRequest) (*ApplyResult, error)
 	// Expiry announcement: drop remote ownership hints when local TTL expires.
 	AnnounceExpiry(context.Context, *ExpiryAnnounce) (*OwnerChangeAck, error)
 	// Closing announces graceful shutdown so peers can proactively adjust.
@@ -155,6 +168,9 @@ func (UnimplementedControlPlaneServer) GetLocalActorIds(context.Context, *Empty)
 func (UnimplementedControlPlaneServer) AnnounceOwnership(context.Context, *OwnershipAnnounce) (*OwnerChangeAck, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method AnnounceOwnership not implemented")
 }
+func (UnimplementedControlPlaneServer) Apply(context.Context, *ApplyRequest) (*ApplyResult, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method Apply not implemented")
+}
 func (UnimplementedControlPlaneServer) AnnounceExpiry(context.Context, *ExpiryAnnounce) (*OwnerChangeAck, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method AnnounceExpiry not implemented")
 }
@@ -254,6 +270,24 @@ func _ControlPlane_AnnounceOwnership_Handler(srv interface{}, ctx context.Contex
 	return interceptor(ctx, in, info, handler)
 }
 
+func _ControlPlane_Apply_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(ApplyRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(ControlPlaneServer).Apply(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: ControlPlane_Apply_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(ControlPlaneServer).Apply(ctx, req.(*ApplyRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 func _ControlPlane_AnnounceExpiry_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(ExpiryAnnounce)
 	if err := dec(in); err != nil {
@@ -313,6 +347,10 @@ var ControlPlane_ServiceDesc = grpc.ServiceDesc{
 			MethodName: "AnnounceOwnership",
 			Handler:    _ControlPlane_AnnounceOwnership_Handler,
 		},
+		{
+			MethodName: "Apply",
+			Handler:    _ControlPlane_Apply_Handler,
+		},
 		{
 			MethodName: "AnnounceExpiry",
 			Handler:    _ControlPlane_AnnounceExpiry_Handler,
diff --git a/pkg/messages/messages.pb.go b/pkg/messages/messages.pb.go
index 2f223c2..bb6b6f9 100644
--- a/pkg/messages/messages.pb.go
+++ b/pkg/messages/messages.pb.go
@@ -1711,6 +1711,440 @@ func (x *RemoveGiftcard) GetId() uint32 {
 	return 0
 }
 
+type Mutation struct {
+	state protoimpl.MessageState `protogen:"open.v1"`
+	// Types that are valid to be assigned to Type:
+	//
+	//	*Mutation_ClearCart
+	//	*Mutation_AddItem
+	//	*Mutation_RemoveItem
+	//	*Mutation_ChangeQuantity
+	//	*Mutation_SetDelivery
+	//	*Mutation_SetPickupPoint
+	//	*Mutation_RemoveDelivery
+	//	*Mutation_SetUserId
+	//	*Mutation_LineItemMarking
+	//	*Mutation_RemoveLineItemMarking
+	//	*Mutation_SubscriptionAdded
+	//	*Mutation_PaymentDeclined
+	//	*Mutation_ConfirmationViewed
+	//	*Mutation_CreateCheckoutOrder
+	//	*Mutation_OrderCreated
+	//	*Mutation_Noop
+	//	*Mutation_InitializeCheckout
+	//	*Mutation_InventoryReserved
+	//	*Mutation_AddVoucher
+	//	*Mutation_RemoveVoucher
+	//	*Mutation_UpsertSubscriptionDetails
+	//	*Mutation_PreConditionFailed
+	//	*Mutation_AddGiftcard
+	//	*Mutation_RemoveGiftcard
+	Type          isMutation_Type `protobuf_oneof:"type"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *Mutation) Reset() {
+	*x = Mutation{}
+	mi := &file_messages_proto_msgTypes[26]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *Mutation) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Mutation) ProtoMessage() {}
+
+func (x *Mutation) ProtoReflect() protoreflect.Message {
+	mi := &file_messages_proto_msgTypes[26]
+	if x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Mutation.ProtoReflect.Descriptor instead.
+func (*Mutation) Descriptor() ([]byte, []int) {
+	return file_messages_proto_rawDescGZIP(), []int{26}
+}
+
+func (x *Mutation) GetType() isMutation_Type {
+	if x != nil {
+		return x.Type
+	}
+	return nil
+}
+
+func (x *Mutation) GetClearCart() *ClearCartRequest {
+	if x != nil {
+		if x, ok := x.Type.(*Mutation_ClearCart); ok {
+			return x.ClearCart
+		}
+	}
+	return nil
+}
+
+func (x *Mutation) GetAddItem() *AddItem {
+	if x != nil {
+		if x, ok := x.Type.(*Mutation_AddItem); ok {
+			return x.AddItem
+		}
+	}
+	return nil
+}
+
+func (x *Mutation) GetRemoveItem() *RemoveItem {
+	if x != nil {
+		if x, ok := x.Type.(*Mutation_RemoveItem); ok {
+			return x.RemoveItem
+		}
+	}
+	return nil
+}
+
+func (x *Mutation) GetChangeQuantity() *ChangeQuantity {
+	if x != nil {
+		if x, ok := x.Type.(*Mutation_ChangeQuantity); ok {
+			return x.ChangeQuantity
+		}
+	}
+	return nil
+}
+
+func (x *Mutation) GetSetDelivery() *SetDelivery {
+	if x != nil {
+		if x, ok := x.Type.(*Mutation_SetDelivery); ok {
+			return x.SetDelivery
+		}
+	}
+	return nil
+}
+
+func (x *Mutation) GetSetPickupPoint() *SetPickupPoint {
+	if x != nil {
+		if x, ok := x.Type.(*Mutation_SetPickupPoint); ok {
+			return x.SetPickupPoint
+		}
+	}
+	return nil
+}
+
+func (x *Mutation) GetRemoveDelivery() *RemoveDelivery {
+	if x != nil {
+		if x, ok := x.Type.(*Mutation_RemoveDelivery); ok {
+			return x.RemoveDelivery
+		}
+	}
+	return nil
+}
+
+func (x *Mutation) GetSetUserId() *SetUserId {
+	if x != nil {
+		if x, ok := x.Type.(*Mutation_SetUserId); ok {
+			return x.SetUserId
+		}
+	}
+	return nil
+}
+
+func (x *Mutation) GetLineItemMarking() *LineItemMarking {
+	if x != nil {
+		if x, ok := x.Type.(*Mutation_LineItemMarking); ok {
+			return x.LineItemMarking
+		}
+	}
+	return nil
+}
+
+func (x *Mutation) GetRemoveLineItemMarking() *RemoveLineItemMarking {
+	if x != nil {
+		if x, ok := x.Type.(*Mutation_RemoveLineItemMarking); ok {
+			return x.RemoveLineItemMarking
+		}
+	}
+	return nil
+}
+
+func (x *Mutation) GetSubscriptionAdded() *SubscriptionAdded {
+	if x != nil {
+		if x, ok := x.Type.(*Mutation_SubscriptionAdded); ok {
+			return x.SubscriptionAdded
+		}
+	}
+	return nil
+}
+
+func (x *Mutation) GetPaymentDeclined() *PaymentDeclined {
+	if x != nil {
+		if x, ok := x.Type.(*Mutation_PaymentDeclined); ok {
+			return x.PaymentDeclined
+		}
+	}
+	return nil
+}
+
+func (x *Mutation) GetConfirmationViewed() *ConfirmationViewed {
+	if x != nil {
+		if x, ok := x.Type.(*Mutation_ConfirmationViewed); ok {
+			return x.ConfirmationViewed
+		}
+	}
+	return nil
+}
+
+func (x *Mutation) GetCreateCheckoutOrder() *CreateCheckoutOrder {
+	if x != nil {
+		if x, ok := x.Type.(*Mutation_CreateCheckoutOrder); ok {
+			return x.CreateCheckoutOrder
+		}
+	}
+	return nil
+}
+
+func (x *Mutation) GetOrderCreated() *OrderCreated {
+	if x != nil {
+		if x, ok := x.Type.(*Mutation_OrderCreated); ok {
+			return x.OrderCreated
+		}
+	}
+	return nil
+}
+
+func (x *Mutation) GetNoop() *Noop {
+	if x != nil {
+		if x, ok := x.Type.(*Mutation_Noop); ok {
+			return x.Noop
+		}
+	}
+	return nil
+}
+
+func (x *Mutation) GetInitializeCheckout() *InitializeCheckout {
+	if x != nil {
+		if x, ok := x.Type.(*Mutation_InitializeCheckout); ok {
+			return x.InitializeCheckout
+		}
+	}
+	return nil
+}
+
+func (x *Mutation) GetInventoryReserved() *InventoryReserved {
+	if x != nil {
+		if x, ok := x.Type.(*Mutation_InventoryReserved); ok {
+			return x.InventoryReserved
+		}
+	}
+	return nil
+}
+
+func (x *Mutation) GetAddVoucher() *AddVoucher {
+	if x != nil {
+		if x, ok := x.Type.(*Mutation_AddVoucher); ok {
+			return x.AddVoucher
+		}
+	}
+	return nil
+}
+
+func (x *Mutation) GetRemoveVoucher() *RemoveVoucher {
+	if x != nil {
+		if x, ok := x.Type.(*Mutation_RemoveVoucher); ok {
+			return x.RemoveVoucher
+		}
+	}
+	return nil
+}
+
+func (x *Mutation) GetUpsertSubscriptionDetails() *UpsertSubscriptionDetails {
+	if x != nil {
+		if x, ok := x.Type.(*Mutation_UpsertSubscriptionDetails); ok {
+			return x.UpsertSubscriptionDetails
+		}
+	}
+	return nil
+}
+
+func (x *Mutation) GetPreConditionFailed() *PreConditionFailed {
+	if x != nil {
+		if x, ok := x.Type.(*Mutation_PreConditionFailed); ok {
+			return x.PreConditionFailed
+		}
+	}
+	return nil
+}
+
+func (x *Mutation) GetAddGiftcard() *AddGiftcard {
+	if x != nil {
+		if x, ok := x.Type.(*Mutation_AddGiftcard); ok {
+			return x.AddGiftcard
+		}
+	}
+	return nil
+}
+
+func (x *Mutation) GetRemoveGiftcard() *RemoveGiftcard {
+	if x != nil {
+		if x, ok := x.Type.(*Mutation_RemoveGiftcard); ok {
+			return x.RemoveGiftcard
+		}
+	}
+	return nil
+}
+
+type isMutation_Type interface {
+	isMutation_Type()
+}
+
+type Mutation_ClearCart struct {
+	ClearCart *ClearCartRequest `protobuf:"bytes,1,opt,name=clear_cart,json=clearCart,proto3,oneof"`
+}
+
+type Mutation_AddItem struct {
+	AddItem *AddItem `protobuf:"bytes,2,opt,name=add_item,json=addItem,proto3,oneof"`
+}
+
+type Mutation_RemoveItem struct {
+	RemoveItem *RemoveItem `protobuf:"bytes,3,opt,name=remove_item,json=removeItem,proto3,oneof"`
+}
+
+type Mutation_ChangeQuantity struct {
+	ChangeQuantity *ChangeQuantity `protobuf:"bytes,4,opt,name=change_quantity,json=changeQuantity,proto3,oneof"`
+}
+
+type Mutation_SetDelivery struct {
+	SetDelivery *SetDelivery `protobuf:"bytes,5,opt,name=set_delivery,json=setDelivery,proto3,oneof"`
+}
+
+type Mutation_SetPickupPoint struct {
+	SetPickupPoint *SetPickupPoint `protobuf:"bytes,6,opt,name=set_pickup_point,json=setPickupPoint,proto3,oneof"`
+}
+
+type Mutation_RemoveDelivery struct {
+	RemoveDelivery *RemoveDelivery `protobuf:"bytes,7,opt,name=remove_delivery,json=removeDelivery,proto3,oneof"`
+}
+
+type Mutation_SetUserId struct {
+	SetUserId *SetUserId `protobuf:"bytes,8,opt,name=set_user_id,json=setUserId,proto3,oneof"`
+}
+
+type Mutation_LineItemMarking struct {
+	LineItemMarking *LineItemMarking `protobuf:"bytes,9,opt,name=line_item_marking,json=lineItemMarking,proto3,oneof"`
+}
+
+type Mutation_RemoveLineItemMarking struct {
+	RemoveLineItemMarking *RemoveLineItemMarking `protobuf:"bytes,10,opt,name=remove_line_item_marking,json=removeLineItemMarking,proto3,oneof"`
+}
+
+type Mutation_SubscriptionAdded struct {
+	SubscriptionAdded *SubscriptionAdded `protobuf:"bytes,11,opt,name=subscription_added,json=subscriptionAdded,proto3,oneof"`
+}
+
+type Mutation_PaymentDeclined struct {
+	PaymentDeclined *PaymentDeclined `protobuf:"bytes,12,opt,name=payment_declined,json=paymentDeclined,proto3,oneof"`
+}
+
+type Mutation_ConfirmationViewed struct {
+	ConfirmationViewed *ConfirmationViewed `protobuf:"bytes,13,opt,name=confirmation_viewed,json=confirmationViewed,proto3,oneof"`
+}
+
+type Mutation_CreateCheckoutOrder struct {
+	CreateCheckoutOrder *CreateCheckoutOrder `protobuf:"bytes,14,opt,name=create_checkout_order,json=createCheckoutOrder,proto3,oneof"`
+}
+
+type Mutation_OrderCreated struct {
+	OrderCreated *OrderCreated `protobuf:"bytes,15,opt,name=order_created,json=orderCreated,proto3,oneof"`
+}
+
+type Mutation_Noop struct {
+	Noop *Noop `protobuf:"bytes,16,opt,name=noop,proto3,oneof"`
+}
+
+type Mutation_InitializeCheckout struct {
+	InitializeCheckout *InitializeCheckout `protobuf:"bytes,17,opt,name=initialize_checkout,json=initializeCheckout,proto3,oneof"`
+}
+
+type Mutation_InventoryReserved struct {
+	InventoryReserved *InventoryReserved `protobuf:"bytes,18,opt,name=inventory_reserved,json=inventoryReserved,proto3,oneof"`
+}
+
+type Mutation_AddVoucher struct {
+	AddVoucher *AddVoucher `protobuf:"bytes,19,opt,name=add_voucher,json=addVoucher,proto3,oneof"`
+}
+
+type Mutation_RemoveVoucher struct {
+	RemoveVoucher *RemoveVoucher `protobuf:"bytes,20,opt,name=remove_voucher,json=removeVoucher,proto3,oneof"`
+}
+
+type Mutation_UpsertSubscriptionDetails struct {
+	UpsertSubscriptionDetails *UpsertSubscriptionDetails `protobuf:"bytes,21,opt,name=upsert_subscription_details,json=upsertSubscriptionDetails,proto3,oneof"`
+}
+
+type Mutation_PreConditionFailed struct {
+	PreConditionFailed *PreConditionFailed `protobuf:"bytes,22,opt,name=pre_condition_failed,json=preConditionFailed,proto3,oneof"`
+}
+
+type Mutation_AddGiftcard struct {
+	AddGiftcard *AddGiftcard `protobuf:"bytes,23,opt,name=add_giftcard,json=addGiftcard,proto3,oneof"`
+}
+
+type Mutation_RemoveGiftcard struct {
+	RemoveGiftcard *RemoveGiftcard `protobuf:"bytes,24,opt,name=remove_giftcard,json=removeGiftcard,proto3,oneof"`
+}
+
+func (*Mutation_ClearCart) isMutation_Type() {}
+
+func (*Mutation_AddItem) isMutation_Type() {}
+
+func (*Mutation_RemoveItem) isMutation_Type() {}
+
+func (*Mutation_ChangeQuantity) isMutation_Type() {}
+
+func (*Mutation_SetDelivery) isMutation_Type() {}
+
+func (*Mutation_SetPickupPoint) isMutation_Type() {}
+
+func (*Mutation_RemoveDelivery) isMutation_Type() {}
+
+func (*Mutation_SetUserId) isMutation_Type() {}
+
+func (*Mutation_LineItemMarking) isMutation_Type() {}
+
+func (*Mutation_RemoveLineItemMarking) isMutation_Type() {}
+
+func (*Mutation_SubscriptionAdded) isMutation_Type() {}
+
+func (*Mutation_PaymentDeclined) isMutation_Type() {}
+
+func (*Mutation_ConfirmationViewed) isMutation_Type() {}
+
+func (*Mutation_CreateCheckoutOrder) isMutation_Type() {}
+
+func (*Mutation_OrderCreated) isMutation_Type() {}
+
+func (*Mutation_Noop) isMutation_Type() {}
+
+func (*Mutation_InitializeCheckout) isMutation_Type() {}
+
+func (*Mutation_InventoryReserved) isMutation_Type() {}
+
+func (*Mutation_AddVoucher) isMutation_Type() {}
+
+func (*Mutation_RemoveVoucher) isMutation_Type() {}
+
+func (*Mutation_UpsertSubscriptionDetails) isMutation_Type() {}
+
+func (*Mutation_PreConditionFailed) isMutation_Type() {}
+
+func (*Mutation_AddGiftcard) isMutation_Type() {}
+
+func (*Mutation_RemoveGiftcard) isMutation_Type() {}
+
 var File_messages_proto protoreflect.FileDescriptor
 
 var file_messages_proto_rawDesc = string([]byte{
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+	0x6c, 0x73, 0x48, 0x00, 0x52, 0x19, 0x75, 0x70, 0x73, 0x65, 0x72, 0x74, 0x53, 0x75, 0x62, 0x73,
+	0x63, 0x72, 0x69, 0x70, 0x74, 0x69, 0x6f, 0x6e, 0x44, 0x65, 0x74, 0x61, 0x69, 0x6c, 0x73, 0x12,
+	0x50, 0x0a, 0x14, 0x70, 0x72, 0x65, 0x5f, 0x63, 0x6f, 0x6e, 0x64, 0x69, 0x74, 0x69, 0x6f, 0x6e,
+	0x5f, 0x66, 0x61, 0x69, 0x6c, 0x65, 0x64, 0x18, 0x16, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x1c, 0x2e,
+	0x6d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x73, 0x2e, 0x50, 0x72, 0x65, 0x43, 0x6f, 0x6e, 0x64,
+	0x69, 0x74, 0x69, 0x6f, 0x6e, 0x46, 0x61, 0x69, 0x6c, 0x65, 0x64, 0x48, 0x00, 0x52, 0x12, 0x70,
+	0x72, 0x65, 0x43, 0x6f, 0x6e, 0x64, 0x69, 0x74, 0x69, 0x6f, 0x6e, 0x46, 0x61, 0x69, 0x6c, 0x65,
+	0x64, 0x12, 0x3a, 0x0a, 0x0c, 0x61, 0x64, 0x64, 0x5f, 0x67, 0x69, 0x66, 0x74, 0x63, 0x61, 0x72,
+	0x64, 0x18, 0x17, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x15, 0x2e, 0x6d, 0x65, 0x73, 0x73, 0x61, 0x67,
+	0x65, 0x73, 0x2e, 0x41, 0x64, 0x64, 0x47, 0x69, 0x66, 0x74, 0x63, 0x61, 0x72, 0x64, 0x48, 0x00,
+	0x52, 0x0b, 0x61, 0x64, 0x64, 0x47, 0x69, 0x66, 0x74, 0x63, 0x61, 0x72, 0x64, 0x12, 0x43, 0x0a,
+	0x0f, 0x72, 0x65, 0x6d, 0x6f, 0x76, 0x65, 0x5f, 0x67, 0x69, 0x66, 0x74, 0x63, 0x61, 0x72, 0x64,
+	0x18, 0x18, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x18, 0x2e, 0x6d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65,
+	0x73, 0x2e, 0x52, 0x65, 0x6d, 0x6f, 0x76, 0x65, 0x47, 0x69, 0x66, 0x74, 0x63, 0x61, 0x72, 0x64,
+	0x48, 0x00, 0x52, 0x0e, 0x72, 0x65, 0x6d, 0x6f, 0x76, 0x65, 0x47, 0x69, 0x66, 0x74, 0x63, 0x61,
+	0x72, 0x64, 0x42, 0x06, 0x0a, 0x04, 0x74, 0x79, 0x70, 0x65, 0x42, 0x2a, 0x5a, 0x28, 0x67, 0x69,
+	0x74, 0x2e, 0x6b, 0x36, 0x6e, 0x2e, 0x6e, 0x65, 0x74, 0x2f, 0x67, 0x6f, 0x2d, 0x63, 0x61, 0x72,
+	0x74, 0x2d, 0x61, 0x63, 0x74, 0x6f, 0x72, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x3b, 0x6d, 0x65,
+	0x73, 0x73, 0x61, 0x67, 0x65, 0x73, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 })
 
 var (
@@ -1947,7 +2486,7 @@ func file_messages_proto_rawDescGZIP() []byte {
 	return file_messages_proto_rawDescData
 }
 
-var file_messages_proto_msgTypes = make([]protoimpl.MessageInfo, 26)
+var file_messages_proto_msgTypes = make([]protoimpl.MessageInfo, 27)
 var file_messages_proto_goTypes = []any{
 	(*ClearCartRequest)(nil),          // 0: messages.ClearCartRequest
 	(*AddItem)(nil),                   // 1: messages.AddItem
@@ -1975,21 +2514,46 @@ var file_messages_proto_goTypes = []any{
 	(*GiftcardItem)(nil),              // 23: messages.GiftcardItem
 	(*AddGiftcard)(nil),               // 24: messages.AddGiftcard
 	(*RemoveGiftcard)(nil),            // 25: messages.RemoveGiftcard
-	(*timestamppb.Timestamp)(nil),     // 26: google.protobuf.Timestamp
-	(*anypb.Any)(nil),                 // 27: google.protobuf.Any
+	(*Mutation)(nil),                  // 26: messages.Mutation
+	(*timestamppb.Timestamp)(nil),     // 27: google.protobuf.Timestamp
+	(*anypb.Any)(nil),                 // 28: google.protobuf.Any
 }
 var file_messages_proto_depIdxs = []int32{
-	26, // 0: messages.AddItem.reservationEndTime:type_name -> google.protobuf.Timestamp
+	27, // 0: messages.AddItem.reservationEndTime:type_name -> google.protobuf.Timestamp
 	6,  // 1: messages.SetDelivery.pickupPoint:type_name -> messages.PickupPoint
-	27, // 2: messages.UpsertSubscriptionDetails.data:type_name -> google.protobuf.Any
-	27, // 3: messages.PreConditionFailed.input:type_name -> google.protobuf.Any
-	27, // 4: messages.GiftcardItem.designConfig:type_name -> google.protobuf.Any
+	28, // 2: messages.UpsertSubscriptionDetails.data:type_name -> google.protobuf.Any
+	28, // 3: messages.PreConditionFailed.input:type_name -> google.protobuf.Any
+	28, // 4: messages.GiftcardItem.designConfig:type_name -> google.protobuf.Any
 	23, // 5: messages.AddGiftcard.giftcard:type_name -> messages.GiftcardItem
-	6,  // [6:6] is the sub-list for method output_type
-	6,  // [6:6] is the sub-list for method input_type
-	6,  // [6:6] is the sub-list for extension type_name
-	6,  // [6:6] is the sub-list for extension extendee
-	0,  // [0:6] is the sub-list for field type_name
+	0,  // 6: messages.Mutation.clear_cart:type_name -> messages.ClearCartRequest
+	1,  // 7: messages.Mutation.add_item:type_name -> messages.AddItem
+	2,  // 8: messages.Mutation.remove_item:type_name -> messages.RemoveItem
+	3,  // 9: messages.Mutation.change_quantity:type_name -> messages.ChangeQuantity
+	4,  // 10: messages.Mutation.set_delivery:type_name -> messages.SetDelivery
+	5,  // 11: messages.Mutation.set_pickup_point:type_name -> messages.SetPickupPoint
+	7,  // 12: messages.Mutation.remove_delivery:type_name -> messages.RemoveDelivery
+	8,  // 13: messages.Mutation.set_user_id:type_name -> messages.SetUserId
+	9,  // 14: messages.Mutation.line_item_marking:type_name -> messages.LineItemMarking
+	10, // 15: messages.Mutation.remove_line_item_marking:type_name -> messages.RemoveLineItemMarking
+	11, // 16: messages.Mutation.subscription_added:type_name -> messages.SubscriptionAdded
+	12, // 17: messages.Mutation.payment_declined:type_name -> messages.PaymentDeclined
+	13, // 18: messages.Mutation.confirmation_viewed:type_name -> messages.ConfirmationViewed
+	14, // 19: messages.Mutation.create_checkout_order:type_name -> messages.CreateCheckoutOrder
+	15, // 20: messages.Mutation.order_created:type_name -> messages.OrderCreated
+	16, // 21: messages.Mutation.noop:type_name -> messages.Noop
+	17, // 22: messages.Mutation.initialize_checkout:type_name -> messages.InitializeCheckout
+	18, // 23: messages.Mutation.inventory_reserved:type_name -> messages.InventoryReserved
+	19, // 24: messages.Mutation.add_voucher:type_name -> messages.AddVoucher
+	20, // 25: messages.Mutation.remove_voucher:type_name -> messages.RemoveVoucher
+	21, // 26: messages.Mutation.upsert_subscription_details:type_name -> messages.UpsertSubscriptionDetails
+	22, // 27: messages.Mutation.pre_condition_failed:type_name -> messages.PreConditionFailed
+	24, // 28: messages.Mutation.add_giftcard:type_name -> messages.AddGiftcard
+	25, // 29: messages.Mutation.remove_giftcard:type_name -> messages.RemoveGiftcard
+	30, // [30:30] is the sub-list for method output_type
+	30, // [30:30] is the sub-list for method input_type
+	30, // [30:30] is the sub-list for extension type_name
+	30, // [30:30] is the sub-list for extension extendee
+	0,  // [0:30] is the sub-list for field type_name
 }
 
 func init() { file_messages_proto_init() }
@@ -2005,13 +2569,39 @@ func file_messages_proto_init() {
 	file_messages_proto_msgTypes[18].OneofWrappers = []any{}
 	file_messages_proto_msgTypes[21].OneofWrappers = []any{}
 	file_messages_proto_msgTypes[23].OneofWrappers = []any{}
+	file_messages_proto_msgTypes[26].OneofWrappers = []any{
+		(*Mutation_ClearCart)(nil),
+		(*Mutation_AddItem)(nil),
+		(*Mutation_RemoveItem)(nil),
+		(*Mutation_ChangeQuantity)(nil),
+		(*Mutation_SetDelivery)(nil),
+		(*Mutation_SetPickupPoint)(nil),
+		(*Mutation_RemoveDelivery)(nil),
+		(*Mutation_SetUserId)(nil),
+		(*Mutation_LineItemMarking)(nil),
+		(*Mutation_RemoveLineItemMarking)(nil),
+		(*Mutation_SubscriptionAdded)(nil),
+		(*Mutation_PaymentDeclined)(nil),
+		(*Mutation_ConfirmationViewed)(nil),
+		(*Mutation_CreateCheckoutOrder)(nil),
+		(*Mutation_OrderCreated)(nil),
+		(*Mutation_Noop)(nil),
+		(*Mutation_InitializeCheckout)(nil),
+		(*Mutation_InventoryReserved)(nil),
+		(*Mutation_AddVoucher)(nil),
+		(*Mutation_RemoveVoucher)(nil),
+		(*Mutation_UpsertSubscriptionDetails)(nil),
+		(*Mutation_PreConditionFailed)(nil),
+		(*Mutation_AddGiftcard)(nil),
+		(*Mutation_RemoveGiftcard)(nil),
+	}
 	type x struct{}
 	out := protoimpl.TypeBuilder{
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: unsafe.Slice(unsafe.StringData(file_messages_proto_rawDesc), len(file_messages_proto_rawDesc)),
 			NumEnums:      0,
-			NumMessages:   26,
+			NumMessages:   27,
 			NumExtensions: 0,
 			NumServices:   0,
 		},
diff --git a/pkg/proxy/remotehost.go b/pkg/proxy/remotehost.go
index cd679b6..960c606 100644
--- a/pkg/proxy/remotehost.go
+++ b/pkg/proxy/remotehost.go
@@ -10,6 +10,7 @@ import (
 	"time"
 
 	messages "git.k6n.net/go-cart-actor/pkg/messages"
+	"github.com/gogo/protobuf/proto"
 	"go.opentelemetry.io/contrib/bridges/otelslog"
 	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/attribute"
@@ -100,6 +101,79 @@ func (h *RemoteHost) Ping() bool {
 	return true
 }
 
+func (h *RemoteHost) Apply(ctx context.Context, id uint64, mutation ...proto.Message) (bool, error) {
+	ctx, cancel := context.WithTimeout(ctx, 5*time.Second)
+	defer cancel()
+
+	toSend := make([]*messages.Mutation, len(mutation))
+	for i, msg := range mutation {
+		switch m := msg.(type) {
+		case *messages.ClearCartRequest:
+			toSend[i] = &messages.Mutation{Type: &messages.Mutation_ClearCart{ClearCart: m}}
+		case *messages.AddItem:
+			toSend[i] = &messages.Mutation{Type: &messages.Mutation_AddItem{AddItem: m}}
+		case *messages.RemoveItem:
+			toSend[i] = &messages.Mutation{Type: &messages.Mutation_RemoveItem{RemoveItem: m}}
+		case *messages.ChangeQuantity:
+			toSend[i] = &messages.Mutation{Type: &messages.Mutation_ChangeQuantity{ChangeQuantity: m}}
+		case *messages.SetDelivery:
+			toSend[i] = &messages.Mutation{Type: &messages.Mutation_SetDelivery{SetDelivery: m}}
+		case *messages.SetPickupPoint:
+			toSend[i] = &messages.Mutation{Type: &messages.Mutation_SetPickupPoint{SetPickupPoint: m}}
+		case *messages.RemoveDelivery:
+			toSend[i] = &messages.Mutation{Type: &messages.Mutation_RemoveDelivery{RemoveDelivery: m}}
+		case *messages.SetUserId:
+			toSend[i] = &messages.Mutation{Type: &messages.Mutation_SetUserId{SetUserId: m}}
+		case *messages.LineItemMarking:
+			toSend[i] = &messages.Mutation{Type: &messages.Mutation_LineItemMarking{LineItemMarking: m}}
+		case *messages.RemoveLineItemMarking:
+			toSend[i] = &messages.Mutation{Type: &messages.Mutation_RemoveLineItemMarking{RemoveLineItemMarking: m}}
+		case *messages.SubscriptionAdded:
+			toSend[i] = &messages.Mutation{Type: &messages.Mutation_SubscriptionAdded{SubscriptionAdded: m}}
+		case *messages.PaymentDeclined:
+			toSend[i] = &messages.Mutation{Type: &messages.Mutation_PaymentDeclined{PaymentDeclined: m}}
+		case *messages.ConfirmationViewed:
+			toSend[i] = &messages.Mutation{Type: &messages.Mutation_ConfirmationViewed{ConfirmationViewed: m}}
+		case *messages.CreateCheckoutOrder:
+			toSend[i] = &messages.Mutation{Type: &messages.Mutation_CreateCheckoutOrder{CreateCheckoutOrder: m}}
+		case *messages.OrderCreated:
+			toSend[i] = &messages.Mutation{Type: &messages.Mutation_OrderCreated{OrderCreated: m}}
+		case *messages.Noop:
+			toSend[i] = &messages.Mutation{Type: &messages.Mutation_Noop{Noop: m}}
+		case *messages.InitializeCheckout:
+			toSend[i] = &messages.Mutation{Type: &messages.Mutation_InitializeCheckout{InitializeCheckout: m}}
+		case *messages.InventoryReserved:
+			toSend[i] = &messages.Mutation{Type: &messages.Mutation_InventoryReserved{InventoryReserved: m}}
+		case *messages.AddVoucher:
+			toSend[i] = &messages.Mutation{Type: &messages.Mutation_AddVoucher{AddVoucher: m}}
+		case *messages.RemoveVoucher:
+			toSend[i] = &messages.Mutation{Type: &messages.Mutation_RemoveVoucher{RemoveVoucher: m}}
+		case *messages.UpsertSubscriptionDetails:
+			toSend[i] = &messages.Mutation{Type: &messages.Mutation_UpsertSubscriptionDetails{UpsertSubscriptionDetails: m}}
+		case *messages.PreConditionFailed:
+			toSend[i] = &messages.Mutation{Type: &messages.Mutation_PreConditionFailed{PreConditionFailed: m}}
+		case *messages.AddGiftcard:
+			toSend[i] = &messages.Mutation{Type: &messages.Mutation_AddGiftcard{AddGiftcard: m}}
+		case *messages.RemoveGiftcard:
+			toSend[i] = &messages.Mutation{Type: &messages.Mutation_RemoveGiftcard{RemoveGiftcard: m}}
+		default:
+			toSend[i] = nil
+		}
+	}
+
+	resp, err := h.controlClient.Apply(ctx, &messages.ApplyRequest{
+		Id:       id,
+		Messages: toSend,
+	})
+	if err != nil {
+		h.missedPings++
+		log.Printf("Apply %s failed: %v", h.host, err)
+		return false, err
+	}
+	h.missedPings = 0
+	return resp.Accepted, nil
+}
+
 func (h *RemoteHost) Negotiate(knownHosts []string) ([]string, error) {
 	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
 	defer cancel()
diff --git a/proto/control_plane.proto b/proto/control_plane.proto
index b0719a8..16b4aa8 100644
--- a/proto/control_plane.proto
+++ b/proto/control_plane.proto
@@ -4,6 +4,8 @@ package messages;
 
 option go_package = "git.k6n.net/go-cart-actor/proto;messages";
 
+import "messages.proto";
+
 // -----------------------------------------------------------------------------
 // Control Plane gRPC API
 // -----------------------------------------------------------------------------
@@ -65,6 +67,16 @@ message ExpiryAnnounce {
   repeated uint64 ids = 2;
 }
 
+message ApplyRequest {
+
+    uint64 id = 1;
+    repeated Mutation messages = 2;
+}
+
+message ApplyResult {
+  bool accepted = 1;
+}
+
 // ControlPlane defines cluster coordination and ownership operations.
 service ControlPlane {
   // Ping for liveness; lightweight health signal.
@@ -80,6 +92,7 @@ service ControlPlane {
 
   // Ownership announcement: first-touch claim broadcast (idempotent; best-effort).
   rpc AnnounceOwnership(OwnershipAnnounce) returns (OwnerChangeAck);
+  rpc Apply(ApplyRequest) returns (ApplyResult);
 
   // Expiry announcement: drop remote ownership hints when local TTL expires.
   rpc AnnounceExpiry(ExpiryAnnounce) returns (OwnerChangeAck);
diff --git a/proto/messages.proto b/proto/messages.proto
index a27af56..6e71140 100644
--- a/proto/messages.proto
+++ b/proto/messages.proto
@@ -171,3 +171,32 @@ message AddGiftcard {
 message RemoveGiftcard {
   uint32 id = 1;
 }
+
+message Mutation {
+  oneof type {
+    ClearCartRequest clear_cart = 1;
+    AddItem add_item = 2;
+    RemoveItem remove_item = 3;
+    ChangeQuantity change_quantity = 4;
+    SetDelivery set_delivery = 5;
+    SetPickupPoint set_pickup_point = 6;
+    RemoveDelivery remove_delivery = 7;
+    SetUserId set_user_id = 8;
+    LineItemMarking line_item_marking = 9;
+    RemoveLineItemMarking remove_line_item_marking = 10;
+    SubscriptionAdded subscription_added = 11;
+    PaymentDeclined payment_declined = 12;
+    ConfirmationViewed confirmation_viewed = 13;
+    CreateCheckoutOrder create_checkout_order = 14;
+    OrderCreated order_created = 15;
+    Noop noop = 16;
+    InitializeCheckout initialize_checkout = 17;
+    InventoryReserved inventory_reserved = 18;
+    AddVoucher add_voucher = 19;
+    RemoveVoucher remove_voucher = 20;
+    UpsertSubscriptionDetails upsert_subscription_details = 21;
+    PreConditionFailed pre_condition_failed = 22;
+    AddGiftcard add_giftcard = 23;
+    RemoveGiftcard remove_giftcard = 24;
+  }
+}