Sinch Verification API

Overview

The Sinch Verification API verifies phone numbers through SMS OTP, Flashcall (missed call CLI), Phone Call (spoken OTP), Data (carrier-level), and WhatsApp OTP. Used for registration, 2FA, and number ownership confirmation.

Agent Instructions

Before generating code, gather from the user (skip any item already specified in the prompt or context):

1. Verification method — sms, flashcall, callout, seamless, or whatsapp.
2. Approach — SDK or direct API calls (curl/fetch/requests)?
3. Language — for SDK: Node.js, Python, Java, or .NET. For direct API: any language, or curl.

When the user chooses SDK, refer to the sinch-sdks skill for installation and client initialization, then to the Verification API Reference linked in Links.

When the user chooses direct API calls, refer to the Verification API Reference linked in Links for request/response schemas.

Security: See the Security section below for url fetching policy, handling inbound callback content, and credential handling.