Integrating OTP Automation into Your CI Pipeline

Phone verification is often the very first thing a new user experiences, which makes it one of the worst places for a silent regression. If a code change quietly breaks your sign-up flow, you may not find out until real users cannot register. Automating OTP verification inside your continuous integration (CI) pipeline catches these problems on every build, long before they reach production. The DUAL SMS API makes this practical by exposing number rental and code retrieval as simple HTTP calls.

This developer guide walks through the pipeline pattern, the reliability practices that keep it from becoming flaky, and a sensible way to roll it out.

The pipeline pattern

A CI verification test mirrors what a real user does, automated end to end. The standard sequence looks like this:

• Check balance at the start of the job so it fails early if funds are low
• Rent a number for the target service and country
• Drive your app's sign-up flow with that number
• Poll the status endpoint for the incoming code
• Release the number and report the result

Make it reliable

Reliability is everything in CI — a flaky test that fails randomly is worse than no test, because the team learns to ignore it. Use sensible timeouts so a slow code never hangs the build, add capped retries with a fresh number when one fails, store your API key as a CI secret rather than in source, and fail fast on the documented error codes so problems are obvious.

Keep it isolated

Run verification tests in their own dedicated stage rather than mixing them with unit tests. This keeps the rest of your suite fast, makes failures easy to attribute, and lets you set different timeout and retry policies for the network-dependent steps.

Where to start

Resist the urge to automate everything at once. Review the API documentation for endpoint formats and example requests, then add a single end-to-end smoke test that covers the happy path. Once that runs reliably in CI for a few days, expand to cover resend, timeout, and multi-country paths.

The goal of a verification test in CI is not to cover every edge case at first — it is to know, on every build, that a real user can still sign up.