Fundamentals BroadNet answer

What is a verification flow?

Last reviewed July 22, 20261 min readReviewed by BroadNet engineering

Quick answer

A verification flow is the end-to-end process that confirms a user controls a phone number or identity — requesting a factor, delivering it over one or more channels, collecting the user's response, and confirming or rejecting it. Modern flows are multi-channel and risk-aware: they cascade methods (network authentication, SMS, voice) so a single failed channel never blocks a legitimate user.

Plain-language definitionVendor-neutralReviewed July 22, 2026

DiagramThe OTP journey, with channel fallback

User requests a codeSign-in, payment or sign-up
Your app calls the verify APIOne request per code
BroadNet delivers the codeOn the best available channelFallback if undeliveredSMSWhatsAppVoice
User enters the codeChecked against the issued code
VerifiedAccess granted

The long answer

Everything worth knowing, nothing that isn't.

§01

The stages

Request (the app asks to verify a number), deliver (a code or network check goes out), respond (the user enters the code or the network confirms possession), and resolve (the flow confirms or fails). Each stage should be logged for security without storing the secret. See /answers/how-to-build-otp-flow.

§02

Make it multi-channel

Cascade methods so reach and cost are balanced: silent network authentication where supported, SMS OTP for universal reach, voice as a fallback. See /answers/best-channel-for-otp and /answers/what-is-silent-network-auth.

§03

Make it risk-aware

Step up verification for risky actions or unusual destinations, and rate-limit to resist abuse — a good flow adapts its friction to the risk. See /answers/what-is-rate-limiting-sms.

§04

Measure it

Track delivery, conversion, and time-to-verify per channel and country, so you can tune the cascade for the markets you actually serve. See /answers/how-to-improve-sms-delivery-rates.

BNWritten by the BroadNet engineering team·Operating carrier-grade messaging since 2003, headquartered in Dubai·Editorial standards

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Topic hubOTP verification explained

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