Module 1: Foundations

Verify API — Two-Factor Authentication

Learn about verify api — two-factor authentication

Duration: 5 minutes
Level: Beginner
Lesson: 6

Introduction

Two-factor authentication (2FA) via SMS or voice is one of the highest-volume messaging use cases. The Telnyx Verify API provides a managed OTP (One-Time Password) service that handles code generation, delivery, rate limiting, and fraud prevention. For NOC engineers, Verify is a critical path — when it breaks, customers' users can't log in.

How OTP Verification Works

The Verification Lifecycle

1. INITIATE  — App requests verification for +15559876543
2. GENERATE  — Telnyx generates OTP (e.g., 847293)
3. DELIVER   — OTP sent via SMS, voice call, or WhatsApp
4. SUBMIT    — User enters code in the app
5. VERIFY    — App sends code to Telnyx for validation
6. RESULT    — Telnyx returns: verified ✓ or failed ✗

   Customer App              Telnyx Verify             User
       │                          │                      │
       │── POST /verifications ──>│                      │
       │<── verification_id ──────│                      │
       │                          │── SMS: "847293" ────>│
       │                          │                      │
       │                          │      (user enters)   │
       │── POST /verify_code ────>│                      │
       │<── status: verified ─────│                      │

slug: "two-factor-auth"

Using the Verify API

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