OTP & Transactional
Priority routing, retry logic, idempotency keys, carrier failover, and WhatsApp OTP fallback.
5 articles
Setting up the OTP API
One endpoint for send, one for verify. Most teams are live in under 30 minutes.
4 min readUpdated 11 Mar 2026How OTP priority routing works
We route each OTP through the fastest live carrier path for that specific destination at that specific moment.
4 min readUpdated 12 Mar 2026OTP retry and failover logic
If the primary route fails, we fail over to the next-fastest one before your user even sees a delay.
3 min readUpdated 13 Mar 2026Idempotency keys for OTP sends
Stop double-sending when a retry happens on your side. Pass an idempotency key and we deduplicate.
2 min readUpdated 14 Mar 2026Using WhatsApp as a fallback for SMS OTP
When SMS is slow or fails, the same OTP is delivered over WhatsApp — usually in under a second.
3 min readUpdated 15 Mar 2026
Other help categories
Browse the rest of the help centre.
Getting started
Create your account, add credits, and send your first message in under fifteen minutes.
SMS campaigns
Templates, DLT routing, sender IDs, delivery reports, scheduling, and retries.
WhatsApp Business API
Onboarding, template approval, chatbot flows, team inbox, quality rating, and analytics.
AI WhatsApp Agents
Train your agent, sync your catalogue, set handoff rules, and go multilingual.
Still stuck?
Our support team responds within 15 minutes during Indian business hours, seven days a week.