Protocols BroadNet answer

What is a messaging webhook?

Last reviewed July 22, 20261 min readReviewed by BroadNet engineering

Quick answer

A messaging webhook is an HTTPS endpoint on your server that a messaging platform calls to push you real-time events — delivery receipts, inbound (mobile-originated) messages, and status changes — instead of you polling an API for them. It is how your application learns that a message was delivered, failed, or received, the instant it happens, so you can react programmatically.

Plain-language definitionVendor-neutralReviewed July 22, 2026

DiagramHow an A2P message reaches the phone

Your applicationSends over the REST API or SMPP
BroadNet platformValidates, routes and bills each message
Operator SMSCDirect operator connection
Subscriber handsetThe message is delivered

The delivery receipt (DLR) travels back along the same path to your webhook

The long answer

Everything worth knowing, nothing that isn't.

§01

What events it delivers

The two most common are delivery receipts (DLRs), which report whether each message reached the handset and why it failed, and inbound messages, which let you build two-way flows and STOP handling. See /answers/what-is-dlr and /answers/what-is-mo-vs-mt.

§02

Why push beats polling

Polling an API for status wastes requests and adds latency; a webhook delivers the event the moment it occurs, so your OTP retries, support routing, and analytics react in real time. See /developers/webhooks.

§03

Verify and secure it

Because anyone can POST to a public URL, sign webhook payloads (for example with HMAC-SHA256) and verify the signature before trusting an event, and always serve the endpoint over HTTPS. See /answers/hmac-sha256-dlr-signing and /tools/webhook-signature-validator.

§04

Make it resilient

Return a fast 2xx and process asynchronously, expect retries and occasional duplicates (so handle events idempotently), and monitor for failures so you never silently miss a delivery event. See /developers/webhooks.

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

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