How to get a Cloud Functions Callback URL to use during an API callback after it completes a money transaction, Flutter App

Question

I need a callback URL so that when a mobile money API completes a payment transaction, my app can receive a message about the transaction status. I'm building a flutter app. I have seen that cloud functions may be the answer. So, I need help on how to get started on creating this callback URL.

I'm yet to try anything because all the material I have seen talks about JavaScript and websites. I need material on doing this in the flutter mobile app.

Answer 1

look at this snippet I hope it helps

// await for your first function t
   await moneyFuntion()
        .whenComplete(() async  => await anotherAPIFuntion())
         .onError((error, stackTrace) {
      log("$error");