OTP / Phone Verification

Need to verify a user's phone number for login, signups, or order confirmations? HighSMS can send one-time verification codes via SMS — from your own phone number, not a random short code.

How It Works

1. Your app calls POST /api/v1/otp/send with the phone number
2. HighSMS sends a verification code via SMS from your device
3. The user enters the code in your app
4. Your app calls POST /api/v1/otp/verify to check it

Customization

• Code length: 4 to 8 digits (default is 6)
• Custom message: write your own template with a {otp} placeholder for the code
• Device selection: choose which phone sends the verification SMS

OTP messages are treated as transactional, so they always go through — even if warmup or opt-out settings would normally block a message.