more customer

cmd/checkout/pool-server.go

@@ -239,15 +239,13 @@ func (s *CheckoutPoolServer) StartCheckoutHandler(w http.ResponseWriter, r *http
 		return
 	}
 
-	// Create checkout with same ID as cart
-	var checkoutId checkout.CheckoutId = cart.MustNewCartId()
-	cookie, err := r.Cookie(checkoutCookieName)
-	if err == nil {
-		parsed, ok := cart.ParseCartId(cookie.Value)
-		if ok {
-			checkoutId = parsed
-		}
-	}
+	// The checkout grain is 1:1 with the cart it checks out (CheckoutId ==
+	// CartId). Keying it by the cart id — not a lingering checkoutid cookie —
+	// means a fresh cart always gets a fresh checkout, so the Klarna order
+	// reflects the cart shown at /kassa. Reusing the cookie made a new cart's
+	// checkout latch onto a previous cart's frozen snapshot (InitializeCheckout
+	// silently refuses to re-snapshot a grain that already has a CartState).
+	checkoutId := checkout.CheckoutId(cartId)
 
 	// Initialize checkout with cart state wrapped in Any
 	cartStateAny := &messages.InitializeCheckout{