Guides•
Designing A2P SMS APIs for OTP flows
A practical look at OTP messaging requirements, delivery feedback, and the developer workflows behind verification flows.
OTP traffic is one of the most trust-sensitive A2P use cases. When a verification code is delayed or silently fails, customers cannot finish sign-up, checkout, or account recovery.
A strong OTP API should make it easy to send the message, track the request, inspect provider responses, and react to delivery events through webhooks.
Dugble's product surface is being scaffolded around those jobs: API keys, message logs, sender setup, delivery status, and team access from one dashboard.