Added payment update action

state/model.go

@@ -8,6 +8,9 @@ const (
 	// initial state
 	StateInitialized PaymentState = "initialized"
 
+	// state given to async payments (eg. GooglePay,ApplePay...)
+	StatePending PaymentState = "pending"
+
 	// state on response
 	StateAccepted               PaymentState = "accepted"
 	StateError                  PaymentState = "error"
@@ -25,4 +28,5 @@ const (
 	GatewayWsPay      PaymentGateway = "wspay"
 	GatewayStripe     PaymentGateway = "stripe"
 	GatewayVivaWallet PaymentGateway = "viva-wallet"
+	GatewayMock       PaymentGateway = "mock"
 )