QR code accounting system between different merchants

I would like to create an accounting system where different subjects after having scanned the QR code of the Seller could specify a certain amount, just a number, and transfer that ‘numerical value’ from his account to another
For example:

  • A scan QR code of B transferring 100
  • B scan QR code of C transferring 50
  • C scan QR code of A transferring 60
    So each Subject has his own QR code and the software has to calculate the new balance of each Subject after each transaction

Other features will be discussed later, thanks

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