API Reference
WhatsApp OTP API Reference
Production API reference for sending WhatsApp OTP messages through the DNZ engine.
Authentication
- Generate the API key from the WhatsApp OTP dashboard.
- Send the key in the JSON body as apiKey because the current engine route validates apiKey from the request body.
- Keep the API key on your backend only. Do not expose it in React, Flutter, or public browser code.
POST
/api/send-otpQueue a WhatsApp OTP or transactional verification message.
Request example
{
"apiKey": "wb_live_xxxxxxxxxxxxx",
"number": "+9647878785391",
"message": "Your DNZ verification code is 482910"
}Response example
{
"jobId": "a8f1c4f3d1",
"accepted": true
}Error codes
- 400 missing_fields
- 400 invalid_number
- 401 invalid_api_key
- 429 plan or rate limit reached
- 500 send_otp_failed
Rate limits
- The public route applies a 120 requests per minute limiter per API key or IP.
- Plan limits also apply before queueing, including monthly usage, daily usage for the free plan, minimum interval, and available WhatsApp slots.