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pkg/checkout/mutation_payment_completed.go

@@ -36,6 +36,12 @@ func HandlePaymentCompleted(g *CheckoutGrain, m *messages.PaymentCompleted) erro
 
 	// Update checkout status
 	g.PaymentInProgress--
+	sum := g.CartState.TotalPrice.IncVat
+
+	for _, payment := range g.SettledPayments() {
+		sum -= payment.Amount
+	}
+	g.AmountInCentsRemaining = sum
 
 	return nil
 }