add more payment related shit

proto/messages.proto

@@ -94,13 +94,39 @@ message SubscriptionAdded {
     string orderReference = 4;
 }
 
+message PaymentStarted {
+  string paymentId = 1;
+  uint32 version = 2;
+  int64 amount = 3;
+  string currency = 4;
+  string provider = 5;
+  optional string method = 6;
+  optional google.protobuf.Timestamp startedAt = 7;
+}
+
+message PaymentCompleted {
+  string paymentId = 1;
+  string status = 2;
+  int64 amount = 3;
+  string currency = 4;
+  optional string processorReference = 5;
+  optional google.protobuf.Timestamp completedAt = 6;
+}
+
 message PaymentDeclined {
-  string message = 1;
-  optional string code = 2;
+  string paymentId = 1;
+  string message = 2;
+  optional string code = 3;
+}
+
+message PaymentEvent {
+    string paymentId = 1;
+    string name = 2;
+    google.protobuf.Any data = 3;
 }
 
 message ConfirmationViewed {
-
+ google.protobuf.Timestamp viewedAt = 1;
 }
 
 message CreateCheckoutOrder {
@@ -198,5 +224,8 @@ message Mutation {
     PreConditionFailed pre_condition_failed = 22;
     AddGiftcard add_giftcard = 23;
     RemoveGiftcard remove_giftcard = 24;
+    PaymentStarted payment_started = 25;
+    PaymentCompleted payment_completed = 26;
+    PaymentEvent payment_event = 27;
   }
 }