What software can send verification codes to others, and who knows how to program them?

1. Wait for the user to click the button to apply for verification code.

2. After the user clicks, a verification code is generated by some algorithm (such as random).

3. Send a short message to the user (provided that the user's mobile phone number is known and the user can input it in the program interface). The short message mode can be short message cat (small-scale, sending at command through serial port) and short message platform (large-scale, communication interface provided by operators).

4. After receiving the short message, the user writes the verification code.

5. Compare whether the user input is consistent with the initial input.

Note: The verification code has a time limit. And it is necessary to verify the identity of users at the same time to reduce the duplication rate.