What are the types of SMS interfaces?

At present, mobile phone verification code platforms are mainly divided into two types: sending and receiving. One is one-to-many SMS, and the other is collaborative SMS interface. The SMS service provider provides an interface to connect with the platform, and the platform can send (downlink) SMS to users through the interface, and can connect with the platform through SMS to achieve certain functions. At present, there are many SMS verification code platforms on the market. I have heard that SMS can basically be used, and it is SMS verification code platform that provides various development interfaces.