Depending on the need of your application, analyze factors such as:
- Are they national or international payments?
- Do they have preference over a bank?
- Which platform offers the lowest percentages of commission per transaction?
There are many online payment platforms that even allow you to pay through convenience stores (OXXO, 7Eleven, Supermarkets, Etc ..).
You can check some of these:
International:
Nationals (Mexico)
I hope you will find this information! PS: I'm new and I can not leave you the links of the sites directly until you get a reputation but you can google: D