diff --git a/cmd/checkout/klarna-client.go b/cmd/checkout/klarna-client.go
index b36f2b5..410121a 100644
--- a/cmd/checkout/klarna-client.go
+++ b/cmd/checkout/klarna-client.go
@@ -80,7 +80,7 @@ func (k *KlarnaClient) CreateOrder(ctx context.Context, reader io.Reader) (*Chec
 	req.Header.Add("Content-Type", "application/json")
 	req.SetBasicAuth(k.UserName, k.Password)
 
-	res, err := http.DefaultClient.Do(req)
+	res, err := k.client.Do(req)
 	if nil != err {
 		return nil, err
 	}
@@ -101,7 +101,7 @@ func (k *KlarnaClient) UpdateOrder(ctx context.Context, orderId string, reader i
 	req.Header.Add("Content-Type", "application/json")
 	req.SetBasicAuth(k.UserName, k.Password)
 
-	res, err := http.DefaultClient.Do(req)
+	res, err := k.client.Do(req)
 	if nil != err {
 		return nil, err
 	}
@@ -119,7 +119,7 @@ func (k *KlarnaClient) AbortOrder(ctx context.Context, orderId string) error {
 	req = req.WithContext(spanCtx)
 	req.SetBasicAuth(k.UserName, k.Password)
 
-	_, err = http.DefaultClient.Do(req)
+	_, err = k.client.Do(req)
 	return err
 }
 
@@ -137,6 +137,6 @@ func (k *KlarnaClient) AcknowledgeOrder(ctx context.Context, orderId string) err
 	req.SetBasicAuth(k.UserName, k.Password)
 	req.Header.Add("Klarna-Idempotency-Key", id.String())
 
-	_, err = http.DefaultClient.Do(req)
+	_, err = k.client.Do(req)
 	return err
 }
diff --git a/cmd/checkout/klarna-handlers.go b/cmd/checkout/klarna-handlers.go
index 4c0d5f0..a336f85 100644
--- a/cmd/checkout/klarna-handlers.go
+++ b/cmd/checkout/klarna-handlers.go
@@ -120,6 +120,7 @@ func (s *CheckoutPoolServer) KlarnaValidationHandler(w http.ResponseWriter, r *h
 	err := json.NewDecoder(r.Body).Decode(order)
 	if err != nil {
 		w.WriteHeader(http.StatusBadRequest)
+		return
 	}
 	logger.InfoContext(r.Context(), "Klarna order validation received", "order_id", order.ID, "cart_id", order.MerchantReference1)
 	grain, err := s.getGrainFromKlarnaOrder(r.Context(), order)
@@ -146,6 +147,7 @@ func (s *CheckoutPoolServer) KlarnaNotificationHandler(w http.ResponseWriter, r
 	err := json.NewDecoder(r.Body).Decode(order)
 	if err != nil {
 		w.WriteHeader(http.StatusBadRequest)
+		return
 	}
 	log.Printf("Klarna order notification: %s", order.ID)
 	logger.InfoContext(r.Context(), "Klarna order notification received", "order_id", order.ID)
diff --git a/cmd/checkout/pool-server.go b/cmd/checkout/pool-server.go
index ca29eba..a182320 100644
--- a/cmd/checkout/pool-server.go
+++ b/cmd/checkout/pool-server.go
@@ -181,6 +181,20 @@ func (s *CheckoutPoolServer) ConfirmationViewedHandler(w http.ResponseWriter, r
 	return s.WriteResult(w, result.Result)
 }
 
+func (s *CheckoutPoolServer) ContactDetailsUpdatedHandler(w http.ResponseWriter, r *http.Request, id checkout.CheckoutId) error {
+	var msg messages.ContactDetailsUpdated
+	if err := json.NewDecoder(r.Body).Decode(&msg); err != nil {
+		return err
+	}
+
+	result, err := s.ApplyLocal(r.Context(), id, &msg)
+	if err != nil {
+		return err
+	}
+
+	return s.WriteResult(w, result.Result)
+}
+
 func (s *CheckoutPoolServer) StartCheckoutHandler(w http.ResponseWriter, r *http.Request) {
 	cartIdStr := r.PathValue("cartid")
 	if cartIdStr == "" {
@@ -512,6 +526,7 @@ func (s *CheckoutPoolServer) Serve(mux *http.ServeMux) {
 	handleFunc("POST /api/checkout/delivery", CookieCheckoutIdHandler(s.ProxyHandler(s.SetDeliveryHandler)))
 	handleFunc("DELETE /api/checkout/delivery/{id}", CookieCheckoutIdHandler(s.ProxyHandler(s.RemoveDeliveryHandler)))
 	handleFunc("POST /api/checkout/pickup-point", CookieCheckoutIdHandler(s.ProxyHandler(s.SetPickupPointHandler)))
+	handleFunc("POST /api/checkout/contact-details", CookieCheckoutIdHandler(s.ProxyHandler(s.ContactDetailsUpdatedHandler)))
 	handleFunc("POST /payment", CookieCheckoutIdHandler(s.ProxyHandler(s.StartPaymentHandler)))
 	handleFunc("GET /payment/{id}/session", CookieCheckoutIdHandler(s.ProxyHandler(s.GetPaymentSessionHandler)))
 	// handleFunc("POST /api/checkout/initialize", CookieCheckoutIdHandler(s.ProxyHandler(s.InitializeCheckoutHandler)))
diff --git a/pkg/checkout/checkout-grain.go b/pkg/checkout/checkout-grain.go
index 0b61ef6..f5729a8 100644
--- a/pkg/checkout/checkout-grain.go
+++ b/pkg/checkout/checkout-grain.go
@@ -73,6 +73,12 @@ func (p *Payment) IsSettled() bool {
 	}
 }
 
+type ContactDetails struct {
+	Email *string `json:"email,omitempty"`
+	Phone *string `json:"phone,omitempty"`
+	Name  *string `json:"name,omitempty"`
+}
+
 type ConfirmationStatus struct {
 	Code         *string   `json:"code,omitempty"`
 	ViewCount    int       `json:"viewCount"`
@@ -97,6 +103,7 @@ type CheckoutGrain struct {
 	InventoryReserved bool                `json:"inventoryReserved"`
 	Confirmation      *ConfirmationStatus `json:"confirmationViewed,omitempty"`
 	Payments          []*Payment          `json:"payments,omitempty"`
+	ContactDetails    *ContactDetails     `json:"contactDetails,omitempty"`
 }
 
 func NewCheckoutGrain(id uint64, cartId cart.CartId, cartVersion uint64, ts time.Time, cartState *cart.CartGrain) *CheckoutGrain {
diff --git a/pkg/checkout/mutation-context.go b/pkg/checkout/mutation-context.go
index e0e45b4..d966d85 100644
--- a/pkg/checkout/mutation-context.go
+++ b/pkg/checkout/mutation-context.go
@@ -26,6 +26,7 @@ func NewCheckoutMutationRegistry(ctx *CheckoutMutationContext) actor.MutationReg
 		actor.NewMutation(HandleSetDelivery),
 		actor.NewMutation(HandleSetPickupPoint),
 		actor.NewMutation(HandleRemoveDelivery),
+		actor.NewMutation(HandleContactDetailsUpdated),
 	)
 	return reg
 }
diff --git a/pkg/checkout/mutation_contact_details_updated.go b/pkg/checkout/mutation_contact_details_updated.go
new file mode 100644
index 0000000..d8fd0f1
--- /dev/null
+++ b/pkg/checkout/mutation_contact_details_updated.go
@@ -0,0 +1,30 @@
+package checkout
+
+import (
+	"fmt"
+
+	checkout_messages "git.k6n.net/go-cart-actor/proto/checkout"
+)
+
+// HandleContactDetailsUpdated mutation
+func HandleContactDetailsUpdated(g *CheckoutGrain, m *checkout_messages.ContactDetailsUpdated) error {
+	if m == nil {
+		return fmt.Errorf("HandleContactDetailsUpdated: nil payload")
+	}
+
+	if g.ContactDetails == nil {
+		g.ContactDetails = &ContactDetails{}
+	}
+
+	if m.Email != nil {
+		g.ContactDetails.Email = m.Email
+	}
+	if m.Phone != nil {
+		g.ContactDetails.Phone = m.Phone
+	}
+	if m.Name != nil {
+		g.ContactDetails.Name = m.Name
+	}
+
+	return nil
+}
diff --git a/pkg/checkout/mutation_contact_details_updated_test.go b/pkg/checkout/mutation_contact_details_updated_test.go
new file mode 100644
index 0000000..f581bb4
--- /dev/null
+++ b/pkg/checkout/mutation_contact_details_updated_test.go
@@ -0,0 +1,94 @@
+package checkout
+
+import (
+	"testing"
+
+	checkout_messages "git.k6n.net/go-cart-actor/proto/checkout"
+)
+
+func TestHandleContactDetailsUpdated(t *testing.T) {
+	tests := []struct {
+		name     string
+		initial  *ContactDetails
+		update   *checkout_messages.ContactDetailsUpdated
+		expected *ContactDetails
+	}{
+		{
+			name:    "update all fields",
+			initial: nil,
+			update: &checkout_messages.ContactDetailsUpdated{
+				Email: stringPtr("test@example.com"),
+				Phone: stringPtr("123456789"),
+				Name:  stringPtr("John Doe"),
+			},
+			expected: &ContactDetails{
+				Email: stringPtr("test@example.com"),
+				Phone: stringPtr("123456789"),
+				Name:  stringPtr("John Doe"),
+			},
+		},
+		{
+			name: "update partial fields",
+			initial: &ContactDetails{
+				Email: stringPtr("old@example.com"),
+				Phone: nil,
+				Name:  stringPtr("Old Name"),
+			},
+			update: &checkout_messages.ContactDetailsUpdated{
+				Phone: stringPtr("987654321"),
+			},
+			expected: &ContactDetails{
+				Email: stringPtr("old@example.com"),
+				Phone: stringPtr("987654321"),
+				Name:  stringPtr("Old Name"),
+			},
+		},
+		{
+			name:     "nil message",
+			initial:  nil,
+			update:   nil,
+			expected: &ContactDetails{}, // but error expected
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			grain := &CheckoutGrain{
+				ContactDetails: tt.initial,
+			}
+
+			err := HandleContactDetailsUpdated(grain, tt.update)
+
+			if tt.name == "nil message" {
+				if err == nil {
+					t.Errorf("expected error for nil message, got nil")
+				}
+				return
+			}
+
+			if err != nil {
+				t.Errorf("unexpected error: %v", err)
+			}
+
+			if grain.ContactDetails == nil && tt.expected != nil {
+				t.Errorf("expected contact details, got nil")
+			} else if grain.ContactDetails != nil && tt.expected == nil {
+				t.Errorf("expected nil contact details, got %v", grain.ContactDetails)
+			} else if grain.ContactDetails != nil && tt.expected != nil {
+				if (grain.ContactDetails.Email == nil && tt.expected.Email != nil) || (grain.ContactDetails.Email != nil && tt.expected.Email == nil) || (grain.ContactDetails.Email != nil && *grain.ContactDetails.Email != *tt.expected.Email) {
+					t.Errorf("email mismatch: got %v, expected %v", grain.ContactDetails.Email, tt.expected.Email)
+				}
+				if (grain.ContactDetails.Phone == nil && tt.expected.Phone != nil) || (grain.ContactDetails.Phone != nil && tt.expected.Phone == nil) || (grain.ContactDetails.Phone != nil && *grain.ContactDetails.Phone != *tt.expected.Phone) {
+					t.Errorf("phone mismatch: got %v, expected %v", grain.ContactDetails.Phone, tt.expected.Phone)
+				}
+				if (grain.ContactDetails.Name == nil && tt.expected.Name != nil) || (grain.ContactDetails.Name != nil && tt.expected.Name == nil) || (grain.ContactDetails.Name != nil && *grain.ContactDetails.Name != *tt.expected.Name) {
+					t.Errorf("name mismatch: got %v, expected %v", grain.ContactDetails.Name, tt.expected.Name)
+				}
+			}
+		})
+	}
+}
+
+func stringPtr(s string) *string {
+	return &s
+}
diff --git a/proto/checkout.proto b/proto/checkout.proto
index 48708ce..f9a610f 100644
--- a/proto/checkout.proto
+++ b/proto/checkout.proto
@@ -80,6 +80,12 @@ message InitializeCheckout {
   google.protobuf.Any cartState = 4;
 }
 
+message ContactDetailsUpdated  {
+    optional string email = 1;
+    optional string phone = 2;
+    optional string name = 3;
+}
+
 message InventoryReserved  {
     string id = 1;
     string status = 2;
@@ -93,7 +99,7 @@ message Mutation {
     RemoveDelivery remove_delivery = 3;
     PaymentDeclined payment_declined = 4;
     ConfirmationViewed confirmation_viewed = 5;
-
+    ContactDetailsUpdated contact_details_updated = 6;
     OrderCreated order_created = 7;
 
     InitializeCheckout initialize_checkout = 9;
diff --git a/proto/checkout/checkout.pb.go b/proto/checkout/checkout.pb.go
index f94c407..8e356ae 100644
--- a/proto/checkout/checkout.pb.go
+++ b/proto/checkout/checkout.pb.go
@@ -771,6 +771,66 @@ func (x *InitializeCheckout) GetCartState() *anypb.Any {
 	return nil
 }
 
+type ContactDetailsUpdated struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Email         *string                `protobuf:"bytes,1,opt,name=email,proto3,oneof" json:"email,omitempty"`
+	Phone         *string                `protobuf:"bytes,2,opt,name=phone,proto3,oneof" json:"phone,omitempty"`
+	Name          *string                `protobuf:"bytes,3,opt,name=name,proto3,oneof" json:"name,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *ContactDetailsUpdated) Reset() {
+	*x = ContactDetailsUpdated{}
+	mi := &file_checkout_proto_msgTypes[11]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *ContactDetailsUpdated) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*ContactDetailsUpdated) ProtoMessage() {}
+
+func (x *ContactDetailsUpdated) ProtoReflect() protoreflect.Message {
+	mi := &file_checkout_proto_msgTypes[11]
+	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 ContactDetailsUpdated.ProtoReflect.Descriptor instead.
+func (*ContactDetailsUpdated) Descriptor() ([]byte, []int) {
+	return file_checkout_proto_rawDescGZIP(), []int{11}
+}
+
+func (x *ContactDetailsUpdated) GetEmail() string {
+	if x != nil && x.Email != nil {
+		return *x.Email
+	}
+	return ""
+}
+
+func (x *ContactDetailsUpdated) GetPhone() string {
+	if x != nil && x.Phone != nil {
+		return *x.Phone
+	}
+	return ""
+}
+
+func (x *ContactDetailsUpdated) GetName() string {
+	if x != nil && x.Name != nil {
+		return *x.Name
+	}
+	return ""
+}
+
 type InventoryReserved struct {
 	state         protoimpl.MessageState `protogen:"open.v1"`
 	Id            string                 `protobuf:"bytes,1,opt,name=id,proto3" json:"id,omitempty"`
@@ -782,7 +842,7 @@ type InventoryReserved struct {
 
 func (x *InventoryReserved) Reset() {
 	*x = InventoryReserved{}
-	mi := &file_checkout_proto_msgTypes[11]
+	mi := &file_checkout_proto_msgTypes[12]
 	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 	ms.StoreMessageInfo(mi)
 }
@@ -794,7 +854,7 @@ func (x *InventoryReserved) String() string {
 func (*InventoryReserved) ProtoMessage() {}
 
 func (x *InventoryReserved) ProtoReflect() protoreflect.Message {
-	mi := &file_checkout_proto_msgTypes[11]
+	mi := &file_checkout_proto_msgTypes[12]
 	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -807,7 +867,7 @@ func (x *InventoryReserved) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use InventoryReserved.ProtoReflect.Descriptor instead.
 func (*InventoryReserved) Descriptor() ([]byte, []int) {
-	return file_checkout_proto_rawDescGZIP(), []int{11}
+	return file_checkout_proto_rawDescGZIP(), []int{12}
 }
 
 func (x *InventoryReserved) GetId() string {
@@ -840,6 +900,7 @@ type Mutation struct {
 	//	*Mutation_RemoveDelivery
 	//	*Mutation_PaymentDeclined
 	//	*Mutation_ConfirmationViewed
+	//	*Mutation_ContactDetailsUpdated
 	//	*Mutation_OrderCreated
 	//	*Mutation_InitializeCheckout
 	//	*Mutation_InventoryReserved
@@ -853,7 +914,7 @@ type Mutation struct {
 
 func (x *Mutation) Reset() {
 	*x = Mutation{}
-	mi := &file_checkout_proto_msgTypes[12]
+	mi := &file_checkout_proto_msgTypes[13]
 	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 	ms.StoreMessageInfo(mi)
 }
@@ -865,7 +926,7 @@ func (x *Mutation) String() string {
 func (*Mutation) ProtoMessage() {}
 
 func (x *Mutation) ProtoReflect() protoreflect.Message {
-	mi := &file_checkout_proto_msgTypes[12]
+	mi := &file_checkout_proto_msgTypes[13]
 	if x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -878,7 +939,7 @@ func (x *Mutation) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Mutation.ProtoReflect.Descriptor instead.
 func (*Mutation) Descriptor() ([]byte, []int) {
-	return file_checkout_proto_rawDescGZIP(), []int{12}
+	return file_checkout_proto_rawDescGZIP(), []int{13}
 }
 
 func (x *Mutation) GetType() isMutation_Type {
@@ -933,6 +994,15 @@ func (x *Mutation) GetConfirmationViewed() *ConfirmationViewed {
 	return nil
 }
 
+func (x *Mutation) GetContactDetailsUpdated() *ContactDetailsUpdated {
+	if x != nil {
+		if x, ok := x.Type.(*Mutation_ContactDetailsUpdated); ok {
+			return x.ContactDetailsUpdated
+		}
+	}
+	return nil
+}
+
 func (x *Mutation) GetOrderCreated() *OrderCreated {
 	if x != nil {
 		if x, ok := x.Type.(*Mutation_OrderCreated); ok {
@@ -1011,6 +1081,10 @@ type Mutation_ConfirmationViewed struct {
 	ConfirmationViewed *ConfirmationViewed `protobuf:"bytes,5,opt,name=confirmation_viewed,json=confirmationViewed,proto3,oneof"`
 }
 
+type Mutation_ContactDetailsUpdated struct {
+	ContactDetailsUpdated *ContactDetailsUpdated `protobuf:"bytes,6,opt,name=contact_details_updated,json=contactDetailsUpdated,proto3,oneof"`
+}
+
 type Mutation_OrderCreated struct {
 	OrderCreated *OrderCreated `protobuf:"bytes,7,opt,name=order_created,json=orderCreated,proto3,oneof"`
 }
@@ -1045,6 +1119,8 @@ func (*Mutation_PaymentDeclined) isMutation_Type() {}
 
 func (*Mutation_ConfirmationViewed) isMutation_Type() {}
 
+func (*Mutation_ContactDetailsUpdated) isMutation_Type() {}
+
 func (*Mutation_OrderCreated) isMutation_Type() {}
 
 func (*Mutation_InitializeCheckout) isMutation_Type() {}
@@ -1178,74 +1254,88 @@ var file_checkout_proto_rawDesc = string([]byte{
 	0x61, 0x72, 0x74, 0x53, 0x74, 0x61, 0x74, 0x65, 0x18, 0x04, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x14,
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+	0x61, 0x67, 0x65, 0x73, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 })
 
 var (
@@ -1260,7 +1350,7 @@ func file_checkout_proto_rawDescGZIP() []byte {
 	return file_checkout_proto_rawDescData
 }
 
-var file_checkout_proto_msgTypes = make([]protoimpl.MessageInfo, 13)
+var file_checkout_proto_msgTypes = make([]protoimpl.MessageInfo, 14)
 var file_checkout_proto_goTypes = []any{
 	(*SetDelivery)(nil),           // 0: checkout_messages.SetDelivery
 	(*SetPickupPoint)(nil),        // 1: checkout_messages.SetPickupPoint
@@ -1273,36 +1363,38 @@ var file_checkout_proto_goTypes = []any{
 	(*ConfirmationViewed)(nil),    // 8: checkout_messages.ConfirmationViewed
 	(*OrderCreated)(nil),          // 9: checkout_messages.OrderCreated
 	(*InitializeCheckout)(nil),    // 10: checkout_messages.InitializeCheckout
-	(*InventoryReserved)(nil),     // 11: checkout_messages.InventoryReserved
-	(*Mutation)(nil),              // 12: checkout_messages.Mutation
-	(*timestamppb.Timestamp)(nil), // 13: google.protobuf.Timestamp
-	(*anypb.Any)(nil),             // 14: google.protobuf.Any
+	(*ContactDetailsUpdated)(nil), // 11: checkout_messages.ContactDetailsUpdated
+	(*InventoryReserved)(nil),     // 12: checkout_messages.InventoryReserved
+	(*Mutation)(nil),              // 13: checkout_messages.Mutation
+	(*timestamppb.Timestamp)(nil), // 14: google.protobuf.Timestamp
+	(*anypb.Any)(nil),             // 15: google.protobuf.Any
 }
 var file_checkout_proto_depIdxs = []int32{
 	2,  // 0: checkout_messages.SetDelivery.pickupPoint:type_name -> checkout_messages.PickupPoint
 	2,  // 1: checkout_messages.SetPickupPoint.pickupPoint:type_name -> checkout_messages.PickupPoint
-	13, // 2: checkout_messages.PaymentStarted.startedAt:type_name -> google.protobuf.Timestamp
-	13, // 3: checkout_messages.PaymentCompleted.completedAt:type_name -> google.protobuf.Timestamp
-	14, // 4: checkout_messages.PaymentEvent.data:type_name -> google.protobuf.Any
-	13, // 5: checkout_messages.ConfirmationViewed.viewedAt:type_name -> google.protobuf.Timestamp
-	13, // 6: checkout_messages.OrderCreated.createdAt:type_name -> google.protobuf.Timestamp
-	14, // 7: checkout_messages.InitializeCheckout.cartState:type_name -> google.protobuf.Any
+	14, // 2: checkout_messages.PaymentStarted.startedAt:type_name -> google.protobuf.Timestamp
+	14, // 3: checkout_messages.PaymentCompleted.completedAt:type_name -> google.protobuf.Timestamp
+	15, // 4: checkout_messages.PaymentEvent.data:type_name -> google.protobuf.Any
+	14, // 5: checkout_messages.ConfirmationViewed.viewedAt:type_name -> google.protobuf.Timestamp
+	14, // 6: checkout_messages.OrderCreated.createdAt:type_name -> google.protobuf.Timestamp
+	15, // 7: checkout_messages.InitializeCheckout.cartState:type_name -> google.protobuf.Any
 	0,  // 8: checkout_messages.Mutation.set_delivery:type_name -> checkout_messages.SetDelivery
 	1,  // 9: checkout_messages.Mutation.set_pickup_point:type_name -> checkout_messages.SetPickupPoint
 	3,  // 10: checkout_messages.Mutation.remove_delivery:type_name -> checkout_messages.RemoveDelivery
 	6,  // 11: checkout_messages.Mutation.payment_declined:type_name -> checkout_messages.PaymentDeclined
 	8,  // 12: checkout_messages.Mutation.confirmation_viewed:type_name -> checkout_messages.ConfirmationViewed
-	9,  // 13: checkout_messages.Mutation.order_created:type_name -> checkout_messages.OrderCreated
-	10, // 14: checkout_messages.Mutation.initialize_checkout:type_name -> checkout_messages.InitializeCheckout
-	11, // 15: checkout_messages.Mutation.inventory_reserved:type_name -> checkout_messages.InventoryReserved
-	4,  // 16: checkout_messages.Mutation.payment_started:type_name -> checkout_messages.PaymentStarted
-	5,  // 17: checkout_messages.Mutation.payment_completed:type_name -> checkout_messages.PaymentCompleted
-	7,  // 18: checkout_messages.Mutation.payment_event:type_name -> checkout_messages.PaymentEvent
-	19, // [19:19] is the sub-list for method output_type
-	19, // [19:19] is the sub-list for method input_type
-	19, // [19:19] is the sub-list for extension type_name
-	19, // [19:19] is the sub-list for extension extendee
-	0,  // [0:19] is the sub-list for field type_name
+	11, // 13: checkout_messages.Mutation.contact_details_updated:type_name -> checkout_messages.ContactDetailsUpdated
+	9,  // 14: checkout_messages.Mutation.order_created:type_name -> checkout_messages.OrderCreated
+	10, // 15: checkout_messages.Mutation.initialize_checkout:type_name -> checkout_messages.InitializeCheckout
+	12, // 16: checkout_messages.Mutation.inventory_reserved:type_name -> checkout_messages.InventoryReserved
+	4,  // 17: checkout_messages.Mutation.payment_started:type_name -> checkout_messages.PaymentStarted
+	5,  // 18: checkout_messages.Mutation.payment_completed:type_name -> checkout_messages.PaymentCompleted
+	7,  // 19: checkout_messages.Mutation.payment_event:type_name -> checkout_messages.PaymentEvent
+	20, // [20:20] is the sub-list for method output_type
+	20, // [20:20] is the sub-list for method input_type
+	20, // [20:20] is the sub-list for extension type_name
+	20, // [20:20] is the sub-list for extension extendee
+	0,  // [0:20] is the sub-list for field type_name
 }
 
 func init() { file_checkout_proto_init() }
@@ -1316,12 +1408,14 @@ func file_checkout_proto_init() {
 	file_checkout_proto_msgTypes[5].OneofWrappers = []any{}
 	file_checkout_proto_msgTypes[6].OneofWrappers = []any{}
 	file_checkout_proto_msgTypes[11].OneofWrappers = []any{}
-	file_checkout_proto_msgTypes[12].OneofWrappers = []any{
+	file_checkout_proto_msgTypes[12].OneofWrappers = []any{}
+	file_checkout_proto_msgTypes[13].OneofWrappers = []any{
 		(*Mutation_SetDelivery)(nil),
 		(*Mutation_SetPickupPoint)(nil),
 		(*Mutation_RemoveDelivery)(nil),
 		(*Mutation_PaymentDeclined)(nil),
 		(*Mutation_ConfirmationViewed)(nil),
+		(*Mutation_ContactDetailsUpdated)(nil),
 		(*Mutation_OrderCreated)(nil),
 		(*Mutation_InitializeCheckout)(nil),
 		(*Mutation_InventoryReserved)(nil),
@@ -1335,7 +1429,7 @@ func file_checkout_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: unsafe.Slice(unsafe.StringData(file_checkout_proto_rawDesc), len(file_checkout_proto_rawDesc)),
 			NumEnums:      0,
-			NumMessages:   13,
+			NumMessages:   14,
 			NumExtensions: 0,
 			NumServices:   0,
 		},