This depends on whether you are looking to build an airtime disbursement application or you are looking to just use an airtime disbursement application.
If you are in the former category please have a look at our API documentation which has tutorial on how to send airtime.
If you are in the latter category reach out to us on firstname.lastname@example.org and we will put you in touch with some of our resellers or a software developer who might help you build an application.
Our airtime product is available in Kenya, Uganda, Tanzania and Nigeria.
For more information, reach out to us on email@example.com