How to use the values Stored on Firebase

Questions about Thunkable
1

Basically I am creating an app for payment (not real) and I have the account balance value stored on firebase. So now I want to do that the ammount value enter by the merchant and the account number. The value will get subtracted from the current account balance value on firebase and update.

Please help me doing so.

2

This topic has an example of how to use cloud variables with Firebase:

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