Send and verify OTP codes

One-time codes for login and verification — send, store the reference, verify.

For App and web developers

1. 1

   Send the code

   POST /otp/send with the recipient number and your Sender ID. Store the returned reference on your server, not in the browser.

2. 2

   Collect the code

   The user types the SMS code in your app. Do not log the code in client analytics.

3. 3

   Verify

   POST /otp/verify with the reference and the code. Treat a successful verify as one-time — do not reuse the same reference.