I want to make an app users can send numbers to one user to another

MIT App Inventor Help
1

I want to make an app which sends number that means just suppose user A sends 10 from his app to user B and also suppose user S has 100 number already in his app , when A sends it becomes 110 in B’s app and vice versa.

                      Example

     A                       B
     100                   100

After A send 10 to user B
A B
90 110

2

Closing, already asked on Kodular

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