How does the app automatically send the registration code to others?

From a third-party verification platform. There are many third-party platforms for SMS verification codes. By cooperating with the corresponding client, the verification code can be automatically sent to the user's mobile phone from the background when necessary, and the user can complete the verification after inputting the corresponding verification code. At this time, the platform is in the middle, with one end connected to the customer to realize the automatic sending and verification of the verification code, and the other end connected to the client to respond to the demand.