diff --git a/README.md b/README.md
index 5fa0634..e0a00a1 100644
--- a/README.md
+++ b/README.md
@@ -1,36 +1,5 @@
 # Go Cart Actor
 
-## Migration Notes (Ring-based Ownership Transition)
-
-This release removes the legacy ConfirmOwner ownership negotiation RPC in favor of deterministic ownership via the consistent hashing ring.
-
-Summary of changes:
-- ConfirmOwner RPC removed from the ControlPlane service.
-- OwnerChangeRequest message removed (was only used by ConfirmOwner).
-- OwnerChangeAck retained solely as the response type for the Closing RPC.
-- SyncedPool now relies exclusively on the ring for ownership (no quorum negotiation).
-- Remote proxy creation includes a bounded readiness retry to reduce first-call failures.
-- New Prometheus ring metrics: 
-  - cart_ring_epoch
-  - cart_ring_hosts
-  - cart_ring_vnodes
-  - cart_ring_host_share{host}
-  - cart_ring_lookup_local_total
-  - cart_ring_lookup_remote_total
-
-Action required for consumers:
-1. Regenerate protobuf code after pulling (requires protoc-gen-go and protoc-gen-go-grpc installed).
-2. Remove any client code or automation invoking ConfirmOwner (calls will now return UNIMPLEMENTED if using stale generated stubs).
-3. Update monitoring/alerts that referenced ConfirmOwner or ownership quorum failures—use ring metrics instead.
-4. If you previously interpreted “ownership flapping” via ConfirmOwner logs, now check for:
-   - Rapid changes in ring epoch (cart_ring_epoch)
-   - Host churn (cart_ring_hosts)
-   - Imbalance in vnode distribution (cart_ring_host_share)
-
-No data migration is necessary; cart IDs and grain state are unaffected.
-
----
-
 A distributed cart management system using the actor model pattern.
 
 ## Prerequisites
diff --git a/cmd/cart/pool-server.go b/cmd/cart/pool-server.go
index fae39e4..b1be858 100644
--- a/cmd/cart/pool-server.go
+++ b/cmd/cart/pool-server.go
@@ -470,6 +470,24 @@ func (s *PoolServer) AddVoucherHandler(w http.ResponseWriter, r *http.Request, c
 	return nil
 }
 
+func (s *PoolServer) SubscriptionDetailsHandler(w http.ResponseWriter, r *http.Request, cartId cart.CartId) error {
+	data := &messages.UpsertSubscriptionDetails{}
+	err := json.NewDecoder(r.Body).Decode(data)
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		w.Write([]byte(err.Error()))
+		return err
+	}
+	reply, err := s.ApplyLocal(cartId, data)
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		w.Write([]byte(err.Error()))
+		return err
+	}
+	s.WriteResult(w, reply)
+	return nil
+}
+
 func (s *PoolServer) RemoveVoucherHandler(w http.ResponseWriter, r *http.Request, cartId cart.CartId) error {
 
 	idStr := r.PathValue("voucherId")
@@ -511,6 +529,7 @@ func (s *PoolServer) Serve() *http.ServeMux {
 	mux.HandleFunc("DELETE /delivery/{deliveryId}", CookieCartIdHandler(s.ProxyHandler(s.RemoveDeliveryHandler)))
 	mux.HandleFunc("PUT /delivery/{deliveryId}/pickupPoint", CookieCartIdHandler(s.ProxyHandler(s.SetPickupPointHandler)))
 	mux.HandleFunc("PUT /voucher", CookieCartIdHandler(s.ProxyHandler(s.AddVoucherHandler)))
+	mux.HandleFunc("PUT /subscription-details", CookieCartIdHandler(s.ProxyHandler(s.SubscriptionDetailsHandler)))
 	mux.HandleFunc("DELETE /voucher/{voucherId}", CookieCartIdHandler(s.ProxyHandler(s.RemoveVoucherHandler)))
 
 	//mux.HandleFunc("GET /checkout", CookieCartIdHandler(s.ProxyHandler(s.HandleCheckout)))
diff --git a/pkg/actor/mutation_registry.go b/pkg/actor/mutation_registry.go
index 8b3d59d..72b7f91 100644
--- a/pkg/actor/mutation_registry.go
+++ b/pkg/actor/mutation_registry.go
@@ -171,11 +171,21 @@ func (r *ProtoMutationRegistry) Apply(grain any, msg ...proto.Message) ([]ApplyR
 	if grain == nil {
 		return results, fmt.Errorf("nil grain")
 	}
+	// Nil slice of mutations still treated as an error (call contract violation).
 	if msg == nil {
 		return results, fmt.Errorf("nil mutation message")
 	}
 
 	for _, m := range msg {
+		// Ignore nil mutation elements (untyped or typed nil pointers) silently; they carry no data.
+		if m == nil {
+			continue
+		}
+		// Typed nil: interface holds concrete proto message type whose pointer value is nil.
+		rv := reflect.ValueOf(m)
+		if rv.Kind() == reflect.Ptr && rv.IsNil() {
+			continue
+		}
 		rt := indirectType(reflect.TypeOf(m))
 		r.mutationRegistryMu.RLock()
 		entry, ok := r.mutationRegistry[rt]
@@ -188,10 +198,6 @@ func (r *ProtoMutationRegistry) Apply(grain any, msg ...proto.Message) ([]ApplyR
 		results = append(results, ApplyResult{Error: err, Type: rt.Name(), Mutation: m})
 	}
 
-	// if entry.updateTotals {
-	// 	grain.UpdateTotals()
-	// }
-
 	return results, nil
 }
 
diff --git a/pkg/cart/cart-grain.go b/pkg/cart/cart-grain.go
index 85aaed1..373a9f9 100644
--- a/pkg/cart/cart-grain.go
+++ b/pkg/cart/cart-grain.go
@@ -61,25 +61,33 @@ type CartNotification struct {
 	Content  string `json:"content"`
 }
 
+type SubscriptionDetails struct {
+	Id           string          `json:"id"`
+	OfferingCode string          `json:"offeringCode,omitempty"`
+	SigningType  string          `json:"signingType,omitempty"`
+	Meta         json.RawMessage `json:"data,omitempty"`
+}
+
 type CartGrain struct {
-	mu                sync.RWMutex
-	lastItemId        uint32
-	lastDeliveryId    uint32
-	lastVoucherId     uint32
-	lastAccess        time.Time
-	lastChange        time.Time // unix seconds of last successful mutation (replay sets from event ts)
-	userId            string
-	Id                CartId             `json:"id"`
-	Items             []*CartItem        `json:"items"`
-	TotalPrice        *Price             `json:"totalPrice"`
-	TotalDiscount     *Price             `json:"totalDiscount"`
-	Deliveries        []*CartDelivery    `json:"deliveries,omitempty"`
-	Processing        bool               `json:"processing"`
-	PaymentInProgress bool               `json:"paymentInProgress"`
-	OrderReference    string             `json:"orderReference,omitempty"`
-	PaymentStatus     string             `json:"paymentStatus,omitempty"`
-	Vouchers          []*Voucher         `json:"vouchers,omitempty"`
-	Notifications     []CartNotification `json:"cartNotification,omitempty"`
+	mu                  sync.RWMutex
+	lastItemId          uint32
+	lastDeliveryId      uint32
+	lastVoucherId       uint32
+	lastAccess          time.Time
+	lastChange          time.Time // unix seconds of last successful mutation (replay sets from event ts)
+	userId              string
+	Id                  CartId                          `json:"id"`
+	Items               []*CartItem                     `json:"items"`
+	TotalPrice          *Price                          `json:"totalPrice"`
+	TotalDiscount       *Price                          `json:"totalDiscount"`
+	Deliveries          []*CartDelivery                 `json:"deliveries,omitempty"`
+	Processing          bool                            `json:"processing"`
+	PaymentInProgress   bool                            `json:"paymentInProgress"`
+	OrderReference      string                          `json:"orderReference,omitempty"`
+	PaymentStatus       string                          `json:"paymentStatus,omitempty"`
+	Vouchers            []*Voucher                      `json:"vouchers,omitempty"`
+	Notifications       []CartNotification              `json:"cartNotification,omitempty"`
+	SubscriptionDetails map[string]*SubscriptionDetails `json:"subscriptionDetails,omitempty"`
 }
 
 type Voucher struct {
@@ -139,17 +147,18 @@ func (v *Voucher) AppliesTo(cart *CartGrain) ([]*CartItem, bool) {
 
 func NewCartGrain(id uint64, ts time.Time) *CartGrain {
 	return &CartGrain{
-		lastItemId:     0,
-		lastDeliveryId: 0,
-		lastVoucherId:  0,
-		lastAccess:     ts,
-		lastChange:     ts,
-		TotalDiscount:  NewPrice(),
-		Vouchers:       []*Voucher{},
-		Deliveries:     []*CartDelivery{},
-		Id:             CartId(id),
-		Items:          []*CartItem{},
-		TotalPrice:     NewPrice(),
+		lastItemId:          0,
+		lastDeliveryId:      0,
+		lastVoucherId:       0,
+		lastAccess:          ts,
+		lastChange:          ts,
+		TotalDiscount:       NewPrice(),
+		Vouchers:            []*Voucher{},
+		Deliveries:          []*CartDelivery{},
+		Id:                  CartId(id),
+		Items:               []*CartItem{},
+		TotalPrice:          NewPrice(),
+		SubscriptionDetails: make(map[string]*SubscriptionDetails),
 	}
 }
 
diff --git a/pkg/cart/cart-mutation-helper.go b/pkg/cart/cart-mutation-helper.go
index 891f9e1..69035bf 100644
--- a/pkg/cart/cart-mutation-helper.go
+++ b/pkg/cart/cart-mutation-helper.go
@@ -42,6 +42,9 @@ func NewCartMultationRegistry() actor.MutationRegistry {
 		actor.NewMutation(RemoveVoucher, func() *messages.RemoveVoucher {
 			return &messages.RemoveVoucher{}
 		}),
+		actor.NewMutation(UpsertSubscriptionDetails, func() *messages.UpsertSubscriptionDetails {
+			return &messages.UpsertSubscriptionDetails{}
+		}),
 	)
 	return reg
 
diff --git a/pkg/cart/mutation_add_item.go b/pkg/cart/mutation_add_item.go
index 9a3a092..e6172cd 100644
--- a/pkg/cart/mutation_add_item.go
+++ b/pkg/cart/mutation_add_item.go
@@ -28,14 +28,23 @@ func AddItem(g *CartGrain, m *messages.AddItem) error {
 		return fmt.Errorf("AddItem: invalid quantity %d", m.Quantity)
 	}
 
-	// Fast path: merge with existing item having same SKU
-	if existing, found := g.FindItemWithSku(m.Sku); found {
-		if existing.StoreId == m.StoreId {
-			existing.Quantity += int(m.Quantity)
-			existing.Stock = StockStatus(m.Stock)
-			existing.StoreId = m.StoreId
-			return nil
+	// Merge with any existing item having same SKU and matching StoreId (including both nil).
+	for _, existing := range g.Items {
+		if existing.Sku != m.Sku {
+			continue
 		}
+		sameStore := (existing.StoreId == nil && m.StoreId == nil) ||
+			(existing.StoreId != nil && m.StoreId != nil && *existing.StoreId == *m.StoreId)
+		if !sameStore {
+			continue
+		}
+		existing.Quantity += int(m.Quantity)
+		existing.Stock = StockStatus(m.Stock)
+		// If existing had nil store but new has one, adopt it.
+		if existing.StoreId == nil && m.StoreId != nil {
+			existing.StoreId = m.StoreId
+		}
+		return nil
 	}
 
 	g.mu.Lock()
diff --git a/pkg/cart/mutation_test.go b/pkg/cart/mutation_test.go
new file mode 100644
index 0000000..68c37a2
--- /dev/null
+++ b/pkg/cart/mutation_test.go
@@ -0,0 +1,520 @@
+package cart
+
+import (
+	"reflect"
+	"slices"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/gogo/protobuf/proto"
+	anypb "google.golang.org/protobuf/types/known/anypb"
+
+	"git.tornberg.me/go-cart-actor/pkg/actor"
+	messages "git.tornberg.me/go-cart-actor/pkg/messages"
+)
+
+// ----------------------
+// Helper constructors
+// ----------------------
+
+func newTestGrain() *CartGrain {
+	return NewCartGrain(123, time.Now())
+}
+
+func newRegistry() actor.MutationRegistry {
+	return NewCartMultationRegistry()
+}
+
+func msgAddItem(sku string, price int64, qty int32, storePtr *string) *messages.AddItem {
+	return &messages.AddItem{
+		Sku:      sku,
+		Price:    price,
+		Quantity: qty,
+		// Tax left 0 -> handler uses default 25%
+		StoreId: storePtr,
+	}
+}
+
+func msgChangeQty(id uint32, qty int32) *messages.ChangeQuantity {
+	return &messages.ChangeQuantity{Id: id, Quantity: qty}
+}
+
+func msgRemoveItem(id uint32) *messages.RemoveItem {
+	return &messages.RemoveItem{Id: id}
+}
+
+func msgSetDelivery(provider string, items ...uint32) *messages.SetDelivery {
+	uitems := make([]uint32, len(items))
+	copy(uitems, items)
+	return &messages.SetDelivery{Provider: provider, Items: uitems}
+}
+
+func msgSetPickupPoint(deliveryId uint32, id string) *messages.SetPickupPoint {
+	return &messages.SetPickupPoint{
+		DeliveryId: deliveryId,
+		Id:         id,
+		Name:       ptr("Pickup"),
+		Address:    ptr("Street 1"),
+		City:       ptr("Town"),
+		Zip:        ptr("12345"),
+		Country:    ptr("SE"),
+	}
+}
+
+func msgClearCart() *messages.ClearCartRequest {
+	return &messages.ClearCartRequest{}
+}
+
+func msgAddVoucher(code string, value int64, rules ...*messages.VoucherRule) *messages.AddVoucher {
+	return &messages.AddVoucher{Code: code, Value: value, VoucherRules: rules}
+}
+
+func msgRemoveVoucher(id uint32) *messages.RemoveVoucher {
+	return &messages.RemoveVoucher{Id: id}
+}
+
+func msgInitializeCheckout(orderId, status string, inProgress bool) *messages.InitializeCheckout {
+	return &messages.InitializeCheckout{OrderId: orderId, Status: status, PaymentInProgress: inProgress}
+}
+
+func msgOrderCreated(orderId, status string) *messages.OrderCreated {
+	return &messages.OrderCreated{OrderId: orderId, Status: status}
+}
+
+func ptr[T any](v T) *T { return &v }
+
+// ----------------------
+// Apply helpers
+// ----------------------
+
+func applyOne(t *testing.T, reg actor.MutationRegistry, g *CartGrain, msg proto.Message) actor.ApplyResult {
+	t.Helper()
+	results, err := reg.Apply(g, msg)
+	if err != nil {
+		t.Fatalf("unexpected registry-level error applying %T: %v", msg, err)
+	}
+	if len(results) != 1 {
+		t.Fatalf("expected exactly one ApplyResult, got %d", len(results))
+	}
+	return results[0]
+}
+
+// Expect success (nil error inside ApplyResult).
+func applyOK(t *testing.T, reg actor.MutationRegistry, g *CartGrain, msg proto.Message) {
+	t.Helper()
+	res := applyOne(t, reg, g, msg)
+	if res.Error != nil {
+		t.Fatalf("expected mutation %s (%T) to succeed, got error: %v", res.Type, msg, res.Error)
+	}
+}
+
+// Expect an error matching substring.
+func applyErrorContains(t *testing.T, reg actor.MutationRegistry, g *CartGrain, msg proto.Message, substr string) {
+	t.Helper()
+	res := applyOne(t, reg, g, msg)
+	if res.Error == nil {
+		t.Fatalf("expected error applying %T, got nil", msg)
+	}
+	if substr != "" && !strings.Contains(res.Error.Error(), substr) {
+		t.Fatalf("error mismatch, want substring %q got %q", substr, res.Error.Error())
+	}
+}
+
+// ----------------------
+// Tests
+// ----------------------
+
+func TestMutationRegistryCoverage(t *testing.T) {
+	reg := newRegistry()
+
+	expected := []string{
+		"AddItem",
+		"ChangeQuantity",
+		"RemoveItem",
+		"InitializeCheckout",
+		"OrderCreated",
+		"RemoveDelivery",
+		"SetDelivery",
+		"SetPickupPoint",
+		"ClearCartRequest",
+		"AddVoucher",
+		"RemoveVoucher",
+		"UpsertSubscriptionDetails",
+	}
+
+	names := reg.(*actor.ProtoMutationRegistry).RegisteredMutations()
+	for _, want := range expected {
+		if !slices.Contains(names, want) {
+			t.Fatalf("registry missing mutation %s; got %v", want, names)
+		}
+	}
+
+	// Create() by name returns correct concrete type.
+	for _, name := range expected {
+		msg, ok := reg.Create(name)
+		if !ok {
+			t.Fatalf("Create failed for %s", name)
+		}
+		rt := reflect.TypeOf(msg)
+		if rt.Kind() == reflect.Ptr {
+			rt = rt.Elem()
+		}
+		if rt.Name() != name {
+			t.Fatalf("Create(%s) returned wrong type %s", name, rt.Name())
+		}
+	}
+
+	// Unregistered create
+	if m, ok := reg.Create("DoesNotExist"); ok || m != nil {
+		t.Fatalf("Create should fail for unknown; got (%T,%v)", m, ok)
+	}
+
+	// GetTypeName sanity
+	add := &messages.AddItem{}
+	nm, ok := reg.GetTypeName(add)
+	if !ok || nm != "AddItem" {
+		t.Fatalf("GetTypeName failed for AddItem, got (%q,%v)", nm, ok)
+	}
+
+	// Apply unregistered message -> result should contain ErrMutationNotRegistered, no top-level error
+	results, err := reg.Apply(newTestGrain(), &messages.Noop{})
+	if err != nil {
+		t.Fatalf("unexpected top-level error applying unregistered mutation: %v", err)
+	}
+	if len(results) != 1 || results[0].Error == nil || results[0].Error != actor.ErrMutationNotRegistered {
+		t.Fatalf("expected ApplyResult with ErrMutationNotRegistered, got %#v", results)
+	}
+}
+
+func TestAddItemAndMerging(t *testing.T) {
+	reg := newRegistry()
+	g := newTestGrain()
+
+	// Merge scenario (same SKU + same store pointer)
+	add1 := msgAddItem("SKU-1", 1000, 2, nil)
+	applyOK(t, reg, g, add1)
+
+	if len(g.Items) != 1 || g.Items[0].Quantity != 2 {
+		t.Fatalf("expected first item added; items=%d qty=%d", len(g.Items), g.Items[0].Quantity)
+	}
+
+	applyOK(t, reg, g, msgAddItem("SKU-1", 1000, 3, nil)) // should merge
+	if len(g.Items) != 1 || g.Items[0].Quantity != 5 {
+		t.Fatalf("expected merge quantity=5 items=%d qty=%d", len(g.Items), g.Items[0].Quantity)
+	}
+
+	// Different store pointer -> new line
+	store := "S1"
+	applyOK(t, reg, g, msgAddItem("SKU-1", 1000, 1, &store))
+	if len(g.Items) != 2 {
+		t.Fatalf("expected second line for different store pointer; items=%d", len(g.Items))
+	}
+
+	// Same store pointer & SKU -> merge with second line
+	applyOK(t, reg, g, msgAddItem("SKU-1", 1000, 4, &store))
+	if len(g.Items) != 2 || g.Items[1].Quantity != 5 {
+		t.Fatalf("expected merge on second line; items=%d second.qty=%d", len(g.Items), g.Items[1].Quantity)
+	}
+
+	// Invalid quantity
+	applyErrorContains(t, reg, g, msgAddItem("BAD", 1000, 0, nil), "invalid quantity")
+}
+
+func TestChangeQuantityBehavior(t *testing.T) {
+	reg := newRegistry()
+	g := newTestGrain()
+
+	applyOK(t, reg, g, msgAddItem("A", 1500, 2, nil))
+	id := g.Items[0].Id
+
+	// Increase quantity
+	applyOK(t, reg, g, msgChangeQty(id, 5))
+	if g.Items[0].Quantity != 5 {
+		t.Fatalf("quantity not updated expected=5 got=%d", g.Items[0].Quantity)
+	}
+
+	// Remove item by setting <=0
+	applyOK(t, reg, g, msgChangeQty(id, 0))
+	if len(g.Items) != 0 {
+		t.Fatalf("expected item removed; items=%d", len(g.Items))
+	}
+
+	// Not found
+	applyErrorContains(t, reg, g, msgChangeQty(9999, 1), "not found")
+}
+
+func TestRemoveItemBehavior(t *testing.T) {
+	reg := newRegistry()
+	g := newTestGrain()
+
+	applyOK(t, reg, g, msgAddItem("X", 1200, 1, nil))
+	id := g.Items[0].Id
+
+	applyOK(t, reg, g, msgRemoveItem(id))
+	if len(g.Items) != 0 {
+		t.Fatalf("expected item removed; items=%d", len(g.Items))
+	}
+
+	applyErrorContains(t, reg, g, msgRemoveItem(id), "not found")
+}
+
+func TestDeliveryMutations(t *testing.T) {
+	reg := newRegistry()
+	g := newTestGrain()
+
+	applyOK(t, reg, g, msgAddItem("D1", 1000, 1, nil))
+	applyOK(t, reg, g, msgAddItem("D2", 2000, 1, nil))
+	i1 := g.Items[0].Id
+
+	// Explicit items
+	applyOK(t, reg, g, msgSetDelivery("POSTNORD", i1))
+	if len(g.Deliveries) != 1 || len(g.Deliveries[0].Items) != 1 || g.Deliveries[0].Items[0] != i1 {
+		t.Fatalf("delivery not created as expected: %+v", g.Deliveries)
+	}
+
+	// Attempt to attach an already-delivered item
+	applyErrorContains(t, reg, g, msgSetDelivery("POSTNORD", i1), "already has a delivery")
+
+	// Attach remaining item via empty list (auto include items without delivery)
+	applyOK(t, reg, g, msgSetDelivery("DHL"))
+	if len(g.Deliveries) != 2 {
+		t.Fatalf("expected second delivery; deliveries=%d", len(g.Deliveries))
+	}
+
+	// Non-existent item
+	applyErrorContains(t, reg, g, msgSetDelivery("UPS", 99999), "not found")
+
+	// No eligible items left
+	applyErrorContains(t, reg, g, msgSetDelivery("UPS"), "no eligible items")
+
+	// Set pickup point on first delivery
+	did := g.Deliveries[0].Id
+	applyOK(t, reg, g, msgSetPickupPoint(did, "PP1"))
+	if g.Deliveries[0].PickupPoint == nil || g.Deliveries[0].PickupPoint.Id != "PP1" {
+		t.Fatalf("pickup point not set correctly: %+v", g.Deliveries[0].PickupPoint)
+	}
+
+	// Bad delivery id
+	applyErrorContains(t, reg, g, msgSetPickupPoint(9999, "PPX"), "delivery id")
+
+	// Remove delivery
+	applyOK(t, reg, g, &messages.RemoveDelivery{Id: did})
+	if len(g.Deliveries) != 1 || g.Deliveries[0].Id == did {
+		t.Fatalf("expected first delivery removed, remaining: %+v", g.Deliveries)
+	}
+
+	// Remove delivery not found
+	applyErrorContains(t, reg, g, &messages.RemoveDelivery{Id: did}, "not found")
+}
+
+func TestClearCart(t *testing.T) {
+	reg := newRegistry()
+	g := newTestGrain()
+
+	applyOK(t, reg, g, msgAddItem("X", 1000, 2, nil))
+	applyOK(t, reg, g, msgSetDelivery("P", g.Items[0].Id))
+
+	applyOK(t, reg, g, msgClearCart())
+
+	if len(g.Items) != 0 || len(g.Deliveries) != 0 {
+		t.Fatalf("expected cart cleared; items=%d deliveries=%d", len(g.Items), len(g.Deliveries))
+	}
+}
+
+func TestVoucherMutations(t *testing.T) {
+	reg := newRegistry()
+	g := newTestGrain()
+
+	applyOK(t, reg, g, msgAddItem("VOUCH", 10000, 1, nil))
+	applyOK(t, reg, g, msgAddVoucher("PROMO", 5000))
+
+	if len(g.Vouchers) != 1 {
+		t.Fatalf("voucher not stored")
+	}
+	if g.TotalDiscount.IncVat != 5000 {
+		t.Fatalf("expected discount 5000 got %d", g.TotalDiscount.IncVat)
+	}
+	if g.TotalPrice.IncVat != 5000 {
+		t.Fatalf("expected total price 5000 got %d", g.TotalPrice.IncVat)
+	}
+
+	// Duplicate voucher code
+	applyErrorContains(t, reg, g, msgAddVoucher("PROMO", 1000), "already applied")
+
+	// Add a large voucher (should not apply because value > total price)
+	applyOK(t, reg, g, msgAddVoucher("BIG", 100000))
+	if len(g.Vouchers) != 2 {
+		t.Fatalf("expected second voucher stored")
+	}
+	if g.TotalDiscount.IncVat != 5000 || g.TotalPrice.IncVat != 5000 {
+		t.Fatalf("large voucher incorrectly applied discount=%d total=%d",
+			g.TotalDiscount.IncVat, g.TotalPrice.IncVat)
+	}
+
+	// Remove existing voucher
+	firstId := g.Vouchers[0].Id
+	applyOK(t, reg, g, msgRemoveVoucher(firstId))
+
+	if slices.ContainsFunc(g.Vouchers, func(v *Voucher) bool { return v.Id == firstId }) {
+		t.Fatalf("voucher id %d not removed", firstId)
+	}
+	// After removing PROMO, BIG remains but is not applied (exceeds price)
+	if g.TotalDiscount.IncVat != 0 || g.TotalPrice.IncVat != 10000 {
+		t.Fatalf("totals incorrect after removal discount=%d total=%d",
+			g.TotalDiscount.IncVat, g.TotalPrice.IncVat)
+	}
+
+	// Remove not applied
+	applyErrorContains(t, reg, g, msgRemoveVoucher(firstId), "not applied")
+}
+
+func TestCheckoutMutations(t *testing.T) {
+	reg := newRegistry()
+	g := newTestGrain()
+
+	applyOK(t, reg, g, msgInitializeCheckout("ORD-1", "PENDING", true))
+	if g.OrderReference != "ORD-1" || g.PaymentStatus != "PENDING" || !g.PaymentInProgress {
+		t.Fatalf("initialize checkout failed: ref=%s status=%s inProgress=%v",
+			g.OrderReference, g.PaymentStatus, g.PaymentInProgress)
+	}
+
+	applyOK(t, reg, g, msgOrderCreated("ORD-1", "COMPLETED"))
+	if g.OrderReference != "ORD-1" || g.PaymentStatus != "COMPLETED" || g.PaymentInProgress {
+		t.Fatalf("order created mutation failed: ref=%s status=%s inProgress=%v",
+			g.OrderReference, g.PaymentStatus, g.PaymentInProgress)
+	}
+
+	applyErrorContains(t, reg, g, msgInitializeCheckout("", "X", true), "missing orderId")
+	applyErrorContains(t, reg, g, msgOrderCreated("", "X"), "missing orderId")
+}
+
+func TestSubscriptionDetailsMutation(t *testing.T) {
+	reg := newRegistry()
+	g := newTestGrain()
+
+	// Upsert new (Id == nil)
+	msgNew := &messages.UpsertSubscriptionDetails{
+		OfferingCode: "OFF1",
+		SigningType:  "TYPE1",
+	}
+	applyOK(t, reg, g, msgNew)
+	if len(g.SubscriptionDetails) != 1 {
+		t.Fatalf("expected one subscription detail; got=%d", len(g.SubscriptionDetails))
+	}
+
+	// Capture created id
+	var createdId string
+	for k := range g.SubscriptionDetails {
+		createdId = k
+	}
+
+	// Update existing
+	msgUpdate := &messages.UpsertSubscriptionDetails{
+		Id:           &createdId,
+		OfferingCode: "OFF2",
+		SigningType:  "TYPE2",
+	}
+	applyOK(t, reg, g, msgUpdate)
+	if g.SubscriptionDetails[createdId].OfferingCode != "OFF2" ||
+		g.SubscriptionDetails[createdId].SigningType != "TYPE2" {
+		t.Fatalf("subscription details not updated: %+v", g.SubscriptionDetails[createdId])
+	}
+
+	// Update non-existent
+	badId := "NON_EXISTENT"
+	applyErrorContains(t, reg, g, &messages.UpsertSubscriptionDetails{Id: &badId}, "not found")
+
+	// Nil mutation should be ignored and produce zero results.
+	resultsNil, errNil := reg.Apply(g, (*messages.UpsertSubscriptionDetails)(nil))
+	if errNil != nil {
+		t.Fatalf("unexpected error for nil mutation element: %v", errNil)
+	}
+	if len(resultsNil) != 0 {
+		t.Fatalf("expected zero results for nil mutation, got %d", len(resultsNil))
+	}
+}
+
+// Ensure registry Apply handles nil grain and nil message defensive errors consistently.
+func TestRegistryDefensiveErrors(t *testing.T) {
+	reg := newRegistry()
+	g := newTestGrain()
+
+	// Nil grain
+	results, err := reg.Apply(nil, &messages.AddItem{})
+	if err == nil {
+		t.Fatalf("expected error for nil grain")
+	}
+	if len(results) != 0 {
+		t.Fatalf("expected no results for nil grain")
+	}
+
+	// Nil message slice
+	results, _ = reg.Apply(g, nil)
+
+	if len(results) != 0 {
+		t.Fatalf("expected no results when message slice nil")
+	}
+}
+func TestSubscriptionDetailsJSONValidation(t *testing.T) {
+	reg := newRegistry()
+	g := newTestGrain()
+
+	// Valid JSON on create
+	validCreate := &messages.UpsertSubscriptionDetails{
+		OfferingCode: "OFFJSON",
+		SigningType:  "TYPEJSON",
+		Data:         &anypb.Any{Value: []byte(`{"ok":true}`)},
+	}
+	applyOK(t, reg, g, validCreate)
+	if len(g.SubscriptionDetails) != 1 {
+		t.Fatalf("expected one subscription detail after valid create, got %d", len(g.SubscriptionDetails))
+	}
+	var id string
+	for k := range g.SubscriptionDetails {
+		id = k
+	}
+	if string(g.SubscriptionDetails[id].Meta) != `{"ok":true}` {
+		t.Fatalf("expected meta stored as valid json, got %s", string(g.SubscriptionDetails[id].Meta))
+	}
+
+	// Update with valid JSON replaces meta
+	updateValid := &messages.UpsertSubscriptionDetails{
+		Id:   &id,
+		Data: &anypb.Any{Value: []byte(`{"changed":123}`)},
+	}
+	applyOK(t, reg, g, updateValid)
+	if string(g.SubscriptionDetails[id].Meta) != `{"changed":123}` {
+		t.Fatalf("expected meta updated to new json, got %s", string(g.SubscriptionDetails[id].Meta))
+	}
+
+	// Invalid JSON on create
+	invalidCreate := &messages.UpsertSubscriptionDetails{
+		OfferingCode: "BAD",
+		Data:         &anypb.Any{Value: []byte(`{"broken":}`)},
+	}
+	res := applyOne(t, reg, g, invalidCreate)
+	if res.Error == nil || !strings.Contains(res.Error.Error(), "invalid json") {
+		t.Fatalf("expected invalid json error on create, got %v", res.Error)
+	}
+
+	// Invalid JSON on update
+	badUpdate := &messages.UpsertSubscriptionDetails{
+		Id:   &id,
+		Data: &anypb.Any{Value: []byte(`{oops`)},
+	}
+	res2 := applyOne(t, reg, g, badUpdate)
+	if res2.Error == nil || !strings.Contains(res2.Error.Error(), "invalid json") {
+		t.Fatalf("expected invalid json error on update, got %v", res2.Error)
+	}
+
+	// Empty Data.Value should not overwrite existing meta
+	emptyUpdate := &messages.UpsertSubscriptionDetails{
+		Id:   &id,
+		Data: &anypb.Any{Value: []byte{}},
+	}
+	applyOK(t, reg, g, emptyUpdate)
+	if string(g.SubscriptionDetails[id].Meta) != `{"changed":123}` {
+		t.Fatalf("empty update should not change meta, got %s", string(g.SubscriptionDetails[id].Meta))
+	}
+}
diff --git a/pkg/cart/mutation_upsert_subscriptiondetails.go b/pkg/cart/mutation_upsert_subscriptiondetails.go
new file mode 100644
index 0000000..1e438bd
--- /dev/null
+++ b/pkg/cart/mutation_upsert_subscriptiondetails.go
@@ -0,0 +1,57 @@
+package cart
+
+import (
+	"encoding/json"
+	"fmt"
+
+	messages "git.tornberg.me/go-cart-actor/pkg/messages"
+)
+
+func UpsertSubscriptionDetails(g *CartGrain, m *messages.UpsertSubscriptionDetails) error {
+	if m == nil {
+		return nil
+	}
+
+	// Create new subscription details when Id is nil.
+	if m.Id == nil {
+		// Validate JSON if provided.
+		var meta json.RawMessage
+		if m.Data != nil && len(m.Data.Value) > 0 {
+			if !json.Valid(m.Data.Value) {
+				return fmt.Errorf("subscription details invalid json")
+			}
+			meta = json.RawMessage(m.Data.Value)
+		}
+
+		id := MustNewCartId().String()
+		g.SubscriptionDetails[id] = &SubscriptionDetails{
+			Id:           id,
+			OfferingCode: m.OfferingCode,
+			SigningType:  m.SigningType,
+			Meta:         meta,
+		}
+		return nil
+	}
+
+	// Update existing entry.
+	existing, ok := g.SubscriptionDetails[*m.Id]
+	if !ok {
+		return fmt.Errorf("subscription details not found")
+	}
+	if m.OfferingCode != "" {
+		existing.OfferingCode = m.OfferingCode
+	}
+	if m.SigningType != "" {
+		existing.SigningType = m.SigningType
+	}
+	if m.Data != nil {
+		// Only validate & assign if there is content; empty -> leave as-is.
+		if len(m.Data.Value) > 0 {
+			if !json.Valid(m.Data.Value) {
+				return fmt.Errorf("subscription details invalid json")
+			}
+			existing.Meta = m.Data.Value
+		}
+	}
+	return nil
+}
diff --git a/cmd/cart/price_test.go b/pkg/cart/price_test.go
similarity index 96%
rename from cmd/cart/price_test.go
rename to pkg/cart/price_test.go
index b7d697a..285424b 100644
--- a/cmd/cart/price_test.go
+++ b/pkg/cart/price_test.go
@@ -1,4 +1,4 @@
-package main
+package cart
 
 import (
 	"encoding/json"
@@ -33,14 +33,14 @@ func TestPriceMarshalJSON(t *testing.T) {
 }
 
 func TestNewPriceFromIncVat(t *testing.T) {
-	p := NewPriceFromIncVat(1000, 0.25)
-	if p.IncVat != 1000 {
-		t.Fatalf("expected IncVat %d got %d", 1000, p.IncVat)
+	p := NewPriceFromIncVat(1250, 25)
+	if p.IncVat != 1250 {
+		t.Fatalf("expected IncVat %d got %d", 1250, p.IncVat)
 	}
 	if p.VatRates[25] != 250 {
 		t.Fatalf("expected VAT 25 rate %d got %d", 250, p.VatRates[25])
 	}
-	if p.ValueExVat() != 750 {
+	if p.ValueExVat() != 1000 {
 		t.Fatalf("expected exVat %d got %d", 750, p.ValueExVat())
 	}
 }
diff --git a/pkg/messages/control_plane.pb.go b/pkg/messages/control_plane.pb.go
index 95aed7d..cf6eeae 100644
--- a/pkg/messages/control_plane.pb.go
+++ b/pkg/messages/control_plane.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.36.5
-// 	protoc        v5.29.3
+// 	protoc-gen-go v1.36.10
+// 	protoc        v6.32.0
 // source: control_plane.proto
 
 package messages
@@ -453,65 +453,38 @@ func (x *ExpiryAnnounce) GetIds() []uint64 {
 
 var File_control_plane_proto protoreflect.FileDescriptor
 
-var file_control_plane_proto_rawDesc = string([]byte{
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-})
+const file_control_plane_proto_rawDesc = "" +
+	"\n" +
+	"\x13control_plane.proto\x12\bmessages\"\a\n" +
+	"\x05Empty\"<\n" +
+	"\tPingReply\x12\x12\n" +
+	"\x04host\x18\x01 \x01(\tR\x04host\x12\x1b\n" +
+	"\tunix_time\x18\x02 \x01(\x03R\bunixTime\"3\n" +
+	"\x10NegotiateRequest\x12\x1f\n" +
+	"\vknown_hosts\x18\x01 \x03(\tR\n" +
+	"knownHosts\"&\n" +
+	"\x0eNegotiateReply\x12\x14\n" +
+	"\x05hosts\x18\x01 \x03(\tR\x05hosts\"!\n" +
+	"\rActorIdsReply\x12\x10\n" +
+	"\x03ids\x18\x01 \x03(\x04R\x03ids\"F\n" +
+	"\x0eOwnerChangeAck\x12\x1a\n" +
+	"\baccepted\x18\x01 \x01(\bR\baccepted\x12\x18\n" +
+	"\amessage\x18\x02 \x01(\tR\amessage\"#\n" +
+	"\rClosingNotice\x12\x12\n" +
+	"\x04host\x18\x01 \x01(\tR\x04host\"9\n" +
+	"\x11OwnershipAnnounce\x12\x12\n" +
+	"\x04host\x18\x01 \x01(\tR\x04host\x12\x10\n" +
+	"\x03ids\x18\x02 \x03(\x04R\x03ids\"6\n" +
+	"\x0eExpiryAnnounce\x12\x12\n" +
+	"\x04host\x18\x01 \x01(\tR\x04host\x12\x10\n" +
+	"\x03ids\x18\x02 \x03(\x04R\x03ids2\x8d\x03\n" +
+	"\fControlPlane\x12,\n" +
+	"\x04Ping\x12\x0f.messages.Empty\x1a\x13.messages.PingReply\x12A\n" +
+	"\tNegotiate\x12\x1a.messages.NegotiateRequest\x1a\x18.messages.NegotiateReply\x12<\n" +
+	"\x10GetLocalActorIds\x12\x0f.messages.Empty\x1a\x17.messages.ActorIdsReply\x12J\n" +
+	"\x11AnnounceOwnership\x12\x1b.messages.OwnershipAnnounce\x1a\x18.messages.OwnerChangeAck\x12D\n" +
+	"\x0eAnnounceExpiry\x12\x18.messages.ExpiryAnnounce\x1a\x18.messages.OwnerChangeAck\x12<\n" +
+	"\aClosing\x12\x17.messages.ClosingNotice\x1a\x18.messages.OwnerChangeAckB.Z,git.tornberg.me/go-cart-actor/proto;messagesb\x06proto3"
 
 var (
 	file_control_plane_proto_rawDescOnce sync.Once
diff --git a/pkg/messages/control_plane_grpc.pb.go b/pkg/messages/control_plane_grpc.pb.go
index d0c9cf5..f95afab 100644
--- a/pkg/messages/control_plane_grpc.pb.go
+++ b/pkg/messages/control_plane_grpc.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go-grpc. DO NOT EDIT.
 // versions:
 // - protoc-gen-go-grpc v1.5.1
-// - protoc             v5.29.3
+// - protoc             v6.32.0
 // source: control_plane.proto
 
 package messages
diff --git a/pkg/messages/messages.pb.go b/pkg/messages/messages.pb.go
index e6e6da1..3e49955 100644
--- a/pkg/messages/messages.pb.go
+++ b/pkg/messages/messages.pb.go
@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.36.5
-// 	protoc        v5.29.3
+// 	protoc-gen-go v1.36.10
+// 	protoc        v6.32.0
 // source: messages.proto
 
 package messages
@@ -9,6 +9,7 @@ package messages
 import (
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	anypb "google.golang.org/protobuf/types/known/anypb"
 	reflect "reflect"
 	sync "sync"
 	unsafe "unsafe"
@@ -1089,153 +1090,199 @@ func (x *RemoveVoucher) GetId() uint32 {
 	return 0
 }
 
+type UpsertSubscriptionDetails struct {
+	state         protoimpl.MessageState `protogen:"open.v1"`
+	Id            *string                `protobuf:"bytes,1,opt,name=id,proto3,oneof" json:"id,omitempty"`
+	OfferingCode  string                 `protobuf:"bytes,2,opt,name=offeringCode,proto3" json:"offeringCode,omitempty"`
+	SigningType   string                 `protobuf:"bytes,3,opt,name=signingType,proto3" json:"signingType,omitempty"`
+	Data          *anypb.Any             `protobuf:"bytes,4,opt,name=data,proto3" json:"data,omitempty"`
+	unknownFields protoimpl.UnknownFields
+	sizeCache     protoimpl.SizeCache
+}
+
+func (x *UpsertSubscriptionDetails) Reset() {
+	*x = UpsertSubscriptionDetails{}
+	mi := &file_messages_proto_msgTypes[15]
+	ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+	ms.StoreMessageInfo(mi)
+}
+
+func (x *UpsertSubscriptionDetails) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*UpsertSubscriptionDetails) ProtoMessage() {}
+
+func (x *UpsertSubscriptionDetails) ProtoReflect() protoreflect.Message {
+	mi := &file_messages_proto_msgTypes[15]
+	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 UpsertSubscriptionDetails.ProtoReflect.Descriptor instead.
+func (*UpsertSubscriptionDetails) Descriptor() ([]byte, []int) {
+	return file_messages_proto_rawDescGZIP(), []int{15}
+}
+
+func (x *UpsertSubscriptionDetails) GetId() string {
+	if x != nil && x.Id != nil {
+		return *x.Id
+	}
+	return ""
+}
+
+func (x *UpsertSubscriptionDetails) GetOfferingCode() string {
+	if x != nil {
+		return x.OfferingCode
+	}
+	return ""
+}
+
+func (x *UpsertSubscriptionDetails) GetSigningType() string {
+	if x != nil {
+		return x.SigningType
+	}
+	return ""
+}
+
+func (x *UpsertSubscriptionDetails) GetData() *anypb.Any {
+	if x != nil {
+		return x.Data
+	}
+	return nil
+}
+
 var File_messages_proto protoreflect.FileDescriptor
 
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-})
+const file_messages_proto_rawDesc = "" +
+	"\n" +
+	"\x0emessages.proto\x12\bmessages\x1a\x19google/protobuf/any.proto\"\x12\n" +
+	"\x10ClearCartRequest\"\x97\x05\n" +
+	"\aAddItem\x12\x17\n" +
+	"\aitem_id\x18\x01 \x01(\rR\x06itemId\x12\x1a\n" +
+	"\bquantity\x18\x02 \x01(\x05R\bquantity\x12\x14\n" +
+	"\x05price\x18\x03 \x01(\x03R\x05price\x12\x1a\n" +
+	"\borgPrice\x18\t \x01(\x03R\borgPrice\x12\x10\n" +
+	"\x03sku\x18\x04 \x01(\tR\x03sku\x12\x12\n" +
+	"\x04name\x18\x05 \x01(\tR\x04name\x12\x14\n" +
+	"\x05image\x18\x06 \x01(\tR\x05image\x12\x14\n" +
+	"\x05stock\x18\a \x01(\x05R\x05stock\x12\x10\n" +
+	"\x03tax\x18\b \x01(\x05R\x03tax\x12\x14\n" +
+	"\x05brand\x18\r \x01(\tR\x05brand\x12\x1a\n" +
+	"\bcategory\x18\x0e \x01(\tR\bcategory\x12\x1c\n" +
+	"\tcategory2\x18\x0f \x01(\tR\tcategory2\x12\x1c\n" +
+	"\tcategory3\x18\x10 \x01(\tR\tcategory3\x12\x1c\n" +
+	"\tcategory4\x18\x11 \x01(\tR\tcategory4\x12\x1c\n" +
+	"\tcategory5\x18\x12 \x01(\tR\tcategory5\x12\x1e\n" +
+	"\n" +
+	"disclaimer\x18\n" +
+	" \x01(\tR\n" +
+	"disclaimer\x12 \n" +
+	"\varticleType\x18\v \x01(\tR\varticleType\x12\x1a\n" +
+	"\bsellerId\x18\x13 \x01(\tR\bsellerId\x12\x1e\n" +
+	"\n" +
+	"sellerName\x18\x14 \x01(\tR\n" +
+	"sellerName\x12\x18\n" +
+	"\acountry\x18\x15 \x01(\tR\acountry\x12\x1b\n" +
+	"\x06outlet\x18\f \x01(\tH\x00R\x06outlet\x88\x01\x01\x12\x1d\n" +
+	"\astoreId\x18\x16 \x01(\tH\x01R\astoreId\x88\x01\x01\x12\x1f\n" +
+	"\bparentId\x18\x17 \x01(\rH\x02R\bparentId\x88\x01\x01B\t\n" +
+	"\a_outletB\n" +
+	"\n" +
+	"\b_storeIdB\v\n" +
+	"\t_parentId\"\x1c\n" +
+	"\n" +
+	"RemoveItem\x12\x0e\n" +
+	"\x02Id\x18\x01 \x01(\rR\x02Id\"<\n" +
+	"\x0eChangeQuantity\x12\x0e\n" +
+	"\x02Id\x18\x01 \x01(\rR\x02Id\x12\x1a\n" +
+	"\bquantity\x18\x02 \x01(\x05R\bquantity\"\x86\x02\n" +
+	"\vSetDelivery\x12\x1a\n" +
+	"\bprovider\x18\x01 \x01(\tR\bprovider\x12\x14\n" +
+	"\x05items\x18\x02 \x03(\rR\x05items\x12<\n" +
+	"\vpickupPoint\x18\x03 \x01(\v2\x15.messages.PickupPointH\x00R\vpickupPoint\x88\x01\x01\x12\x18\n" +
+	"\acountry\x18\x04 \x01(\tR\acountry\x12\x10\n" +
+	"\x03zip\x18\x05 \x01(\tR\x03zip\x12\x1d\n" +
+	"\aaddress\x18\x06 \x01(\tH\x01R\aaddress\x88\x01\x01\x12\x17\n" +
+	"\x04city\x18\a \x01(\tH\x02R\x04city\x88\x01\x01B\x0e\n" +
+	"\f_pickupPointB\n" +
+	"\n" +
+	"\b_addressB\a\n" +
+	"\x05_city\"\xf9\x01\n" +
+	"\x0eSetPickupPoint\x12\x1e\n" +
+	"\n" +
+	"deliveryId\x18\x01 \x01(\rR\n" +
+	"deliveryId\x12\x0e\n" +
+	"\x02id\x18\x02 \x01(\tR\x02id\x12\x17\n" +
+	"\x04name\x18\x03 \x01(\tH\x00R\x04name\x88\x01\x01\x12\x1d\n" +
+	"\aaddress\x18\x04 \x01(\tH\x01R\aaddress\x88\x01\x01\x12\x17\n" +
+	"\x04city\x18\x05 \x01(\tH\x02R\x04city\x88\x01\x01\x12\x15\n" +
+	"\x03zip\x18\x06 \x01(\tH\x03R\x03zip\x88\x01\x01\x12\x1d\n" +
+	"\acountry\x18\a \x01(\tH\x04R\acountry\x88\x01\x01B\a\n" +
+	"\x05_nameB\n" +
+	"\n" +
+	"\b_addressB\a\n" +
+	"\x05_cityB\x06\n" +
+	"\x04_zipB\n" +
+	"\n" +
+	"\b_country\"\xd6\x01\n" +
+	"\vPickupPoint\x12\x0e\n" +
+	"\x02id\x18\x01 \x01(\tR\x02id\x12\x17\n" +
+	"\x04name\x18\x02 \x01(\tH\x00R\x04name\x88\x01\x01\x12\x1d\n" +
+	"\aaddress\x18\x03 \x01(\tH\x01R\aaddress\x88\x01\x01\x12\x17\n" +
+	"\x04city\x18\x04 \x01(\tH\x02R\x04city\x88\x01\x01\x12\x15\n" +
+	"\x03zip\x18\x05 \x01(\tH\x03R\x03zip\x88\x01\x01\x12\x1d\n" +
+	"\acountry\x18\x06 \x01(\tH\x04R\acountry\x88\x01\x01B\a\n" +
+	"\x05_nameB\n" +
+	"\n" +
+	"\b_addressB\a\n" +
+	"\x05_cityB\x06\n" +
+	"\x04_zipB\n" +
+	"\n" +
+	"\b_country\" \n" +
+	"\x0eRemoveDelivery\x12\x0e\n" +
+	"\x02id\x18\x01 \x01(\rR\x02id\"\xb9\x01\n" +
+	"\x13CreateCheckoutOrder\x12\x14\n" +
+	"\x05terms\x18\x01 \x01(\tR\x05terms\x12\x1a\n" +
+	"\bcheckout\x18\x02 \x01(\tR\bcheckout\x12\"\n" +
+	"\fconfirmation\x18\x03 \x01(\tR\fconfirmation\x12\x12\n" +
+	"\x04push\x18\x04 \x01(\tR\x04push\x12\x1e\n" +
+	"\n" +
+	"validation\x18\x05 \x01(\tR\n" +
+	"validation\x12\x18\n" +
+	"\acountry\x18\x06 \x01(\tR\acountry\"@\n" +
+	"\fOrderCreated\x12\x18\n" +
+	"\aorderId\x18\x01 \x01(\tR\aorderId\x12\x16\n" +
+	"\x06status\x18\x02 \x01(\tR\x06status\"\x06\n" +
+	"\x04Noop\"t\n" +
+	"\x12InitializeCheckout\x12\x18\n" +
+	"\aorderId\x18\x01 \x01(\tR\aorderId\x12\x16\n" +
+	"\x06status\x18\x02 \x01(\tR\x06status\x12,\n" +
+	"\x11paymentInProgress\x18\x03 \x01(\bR\x11paymentInProgress\"y\n" +
+	"\vVoucherRule\x12\x12\n" +
+	"\x04type\x18\x02 \x01(\tR\x04type\x12 \n" +
+	"\vdescription\x18\x03 \x01(\tR\vdescription\x12\x1c\n" +
+	"\tcondition\x18\x04 \x01(\tR\tcondition\x12\x16\n" +
+	"\x06action\x18\x05 \x01(\tR\x06action\"q\n" +
+	"\n" +
+	"AddVoucher\x12\x12\n" +
+	"\x04code\x18\x01 \x01(\tR\x04code\x12\x14\n" +
+	"\x05value\x18\x02 \x01(\x03R\x05value\x129\n" +
+	"\fvoucherRules\x18\x03 \x03(\v2\x15.messages.VoucherRuleR\fvoucherRules\"\x1f\n" +
+	"\rRemoveVoucher\x12\x0e\n" +
+	"\x02id\x18\x01 \x01(\rR\x02id\"\xa7\x01\n" +
+	"\x19UpsertSubscriptionDetails\x12\x13\n" +
+	"\x02id\x18\x01 \x01(\tH\x00R\x02id\x88\x01\x01\x12\"\n" +
+	"\fofferingCode\x18\x02 \x01(\tR\fofferingCode\x12 \n" +
+	"\vsigningType\x18\x03 \x01(\tR\vsigningType\x12(\n" +
+	"\x04data\x18\x04 \x01(\v2\x14.google.protobuf.AnyR\x04dataB\x05\n" +
+	"\x03_idB.Z,git.tornberg.me/go-cart-actor/proto;messagesb\x06proto3"
 
 var (
 	file_messages_proto_rawDescOnce sync.Once
@@ -1249,32 +1296,35 @@ func file_messages_proto_rawDescGZIP() []byte {
 	return file_messages_proto_rawDescData
 }
 
-var file_messages_proto_msgTypes = make([]protoimpl.MessageInfo, 15)
+var file_messages_proto_msgTypes = make([]protoimpl.MessageInfo, 16)
 var file_messages_proto_goTypes = []any{
-	(*ClearCartRequest)(nil),    // 0: messages.ClearCartRequest
-	(*AddItem)(nil),             // 1: messages.AddItem
-	(*RemoveItem)(nil),          // 2: messages.RemoveItem
-	(*ChangeQuantity)(nil),      // 3: messages.ChangeQuantity
-	(*SetDelivery)(nil),         // 4: messages.SetDelivery
-	(*SetPickupPoint)(nil),      // 5: messages.SetPickupPoint
-	(*PickupPoint)(nil),         // 6: messages.PickupPoint
-	(*RemoveDelivery)(nil),      // 7: messages.RemoveDelivery
-	(*CreateCheckoutOrder)(nil), // 8: messages.CreateCheckoutOrder
-	(*OrderCreated)(nil),        // 9: messages.OrderCreated
-	(*Noop)(nil),                // 10: messages.Noop
-	(*InitializeCheckout)(nil),  // 11: messages.InitializeCheckout
-	(*VoucherRule)(nil),         // 12: messages.VoucherRule
-	(*AddVoucher)(nil),          // 13: messages.AddVoucher
-	(*RemoveVoucher)(nil),       // 14: messages.RemoveVoucher
+	(*ClearCartRequest)(nil),          // 0: messages.ClearCartRequest
+	(*AddItem)(nil),                   // 1: messages.AddItem
+	(*RemoveItem)(nil),                // 2: messages.RemoveItem
+	(*ChangeQuantity)(nil),            // 3: messages.ChangeQuantity
+	(*SetDelivery)(nil),               // 4: messages.SetDelivery
+	(*SetPickupPoint)(nil),            // 5: messages.SetPickupPoint
+	(*PickupPoint)(nil),               // 6: messages.PickupPoint
+	(*RemoveDelivery)(nil),            // 7: messages.RemoveDelivery
+	(*CreateCheckoutOrder)(nil),       // 8: messages.CreateCheckoutOrder
+	(*OrderCreated)(nil),              // 9: messages.OrderCreated
+	(*Noop)(nil),                      // 10: messages.Noop
+	(*InitializeCheckout)(nil),        // 11: messages.InitializeCheckout
+	(*VoucherRule)(nil),               // 12: messages.VoucherRule
+	(*AddVoucher)(nil),                // 13: messages.AddVoucher
+	(*RemoveVoucher)(nil),             // 14: messages.RemoveVoucher
+	(*UpsertSubscriptionDetails)(nil), // 15: messages.UpsertSubscriptionDetails
+	(*anypb.Any)(nil),                 // 16: google.protobuf.Any
 }
 var file_messages_proto_depIdxs = []int32{
 	6,  // 0: messages.SetDelivery.pickupPoint:type_name -> messages.PickupPoint
 	12, // 1: messages.AddVoucher.voucherRules:type_name -> messages.VoucherRule
-	2,  // [2:2] is the sub-list for method output_type
-	2,  // [2:2] is the sub-list for method input_type
-	2,  // [2:2] is the sub-list for extension type_name
-	2,  // [2:2] is the sub-list for extension extendee
-	0,  // [0:2] is the sub-list for field type_name
+	16, // 2: messages.UpsertSubscriptionDetails.data:type_name -> google.protobuf.Any
+	3,  // [3:3] is the sub-list for method output_type
+	3,  // [3:3] is the sub-list for method input_type
+	3,  // [3:3] is the sub-list for extension type_name
+	3,  // [3:3] is the sub-list for extension extendee
+	0,  // [0:3] is the sub-list for field type_name
 }
 
 func init() { file_messages_proto_init() }
@@ -1286,13 +1336,14 @@ func file_messages_proto_init() {
 	file_messages_proto_msgTypes[4].OneofWrappers = []any{}
 	file_messages_proto_msgTypes[5].OneofWrappers = []any{}
 	file_messages_proto_msgTypes[6].OneofWrappers = []any{}
+	file_messages_proto_msgTypes[15].OneofWrappers = []any{}
 	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:   15,
+			NumMessages:   16,
 			NumExtensions: 0,
 			NumServices:   0,
 		},
diff --git a/proto/messages.proto b/proto/messages.proto
index 42a94ac..009fcf2 100644
--- a/proto/messages.proto
+++ b/proto/messages.proto
@@ -2,6 +2,8 @@ syntax = "proto3";
 package messages;
 option go_package = "git.tornberg.me/go-cart-actor/proto;messages";
 
+import "google/protobuf/any.proto";
+
 message ClearCartRequest {
 
 }
@@ -114,3 +116,12 @@ message AddVoucher {
 message RemoveVoucher {
     uint32 id = 1;
 }
+
+message UpsertSubscriptionDetails {
+
+      optional string id = 1;
+      string offeringCode = 2;
+      string signingType    = 3;
+      google.protobuf.Any data = 4;
+
+}