What is a Bang Cheng CAPTCHA

Captcha codes sent by Bang Cheng. SMS CAPTCHA is an effective CAPTCHA system by sending CAPTCHA to cell phone. Both large websites, especially shopping websites, provide cell phone SMS CAPTCHA function, which can ensure the safety of shopping and verify the correctness of users in a more accurate and safe way. Some CAPTCHA access providers provide cell phone SMS CAPTCHA service, each website sends a request to the access provider's server through the interface, the server sends random numbers or letters to the cell phone, and the access provider's server is unified to do the verification of CAPTCHA.