I want to develop payment by myself, how can I connect it with apifm?

After the user pays successfully, call our backend api interface on your server to synchronize the recharge record to our system./user/apiExtUserPay/add Backend API docs： [#](#)  You can also use the nextAction field to implement subsequent processing logic after payment, otherwise the user balance will be increased. Related reading: ["Basic Authentication calls the background interface without login"](https://www.yuque.com/apifm/doc/guzeid) ["Detailed explanation of nextAction parameter usage"](https://www.yuque.com/apifm/doc/aetmlb)