Direct sending to dataphone amount to be collected

In order to avoid errors and have more control, it would be very interesting to have the option to send the amount (modifiable) directly from Unified to the dataphone. Such as Revo allows to do for example using the ISO 8583 format.
We have done the test of trying to get him to pay through the app, but once the customer is at the reception it is too slow (depending on the customer's ability).