Mobile Topup and Airtime Recharge
1. The customer wants to do top up, and comes to the agent / shop.
2. The user initiates the transactions on the printer. He enters to the printer menu and selects the mobile operators, enters the mobile phone and the amount.
3. The information is sent to the server or SMS gateway.
4. The server or SMS gateway receives the information and responds to the printer.
5. The printer receives the response from web server and prints the receipt, including the contents of transaction ID, Mobile No., Amount, Operator, etc.