how to develop mobile recharge api

What precisely has to be developed is .. you wish to line up a server 1st all.. well integrated with Operator API’s ( you wish to form in an exceedingly heap of efforts to urge the supply.. attempt your best.. if you cannot drop Maine a message ) then ought to develop a portal.. with a flexibility to route any company recharge to any operator API its not that easy because it has to heap in effort to code all that flexibility . how to develop mobile recharge api