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Facebook Messages API

The Messages API from Facebook — 2 operation(s) for messages.

Facebook Messages API is one of 21 APIs that Facebook publishes on the APIs.io network, described by a machine-readable OpenAPI specification.

Tagged areas include Message. The published artifact set on APIs.io includes an OpenAPI specification, API documentation, an API reference, and authentication docs.

This API exposes 2 operations across 2 paths, and defines 4 schemas. It is described by OpenAPI 3.0.3, at version 21.0.

Requests are made against a single base URL, https://graph.facebook.com/v21.0.

2 operations 2 paths 4 schemas 2 POST

Metadata

The identity and technical contract details declared by the specification.

Specification
OpenAPI 3.0.3
API Version
21.0
Base URL
https://graph.facebook.com
Authentication
HTTP Bearer
Resource Areas
1

Authentication & Security 1

Facebook Messages API declares 1 security scheme for authenticating requests. It accepts HTTP bearer tokens (BearerAuth). By default, every request must be authenticated.

  • BearerAuth — OAuth 2.0 access token for Facebook Graph API.

Paths & Operations 2

Across 2 paths, the API surfaces 2 operations — 2 POST. Each is listed below with its method, path, parameters, and response codes.

Messages 2
POST
/{page-id}/messages
Facebook Send Message
sendMessage 1 param body → 200400
POST
/{phone-number-id}/messages
Facebook Send WhatsApp Message
sendWhatsAppMessage 1 param body → 200400

Schemas 4

The contract defines 4 schemas that model the data the API accepts and returns. The most detailed are WhatsAppMessageRequest (5 properties), WhatsAppMessageResponse (3 properties), SendMessageRequest (3 properties), SendMessageResponse (2 properties). Each schema is shown below with its type and property counts.

SendMessageResponse
object
Response from sending a message.
2 properties
WhatsAppMessageRequest
object
Request to send a WhatsApp message.
5 properties 3 required
SendMessageRequest
object
Request to send a message.
3 properties 3 required
WhatsAppMessageResponse
object
Response from sending a WhatsApp message.
3 properties

Specification

The full machine-readable OpenAPI contract behind this narrative.

Source

facebook-messages-api-openapi.yml Raw ↑

Other APIs Facebook publishes across the network.

Facebook Ad Accounts API
Facebook Ad Sets API
Facebook Ads API
Facebook Audiences API
Facebook Authentication API
Facebook Campaigns API
Facebook Comments API
Facebook Conversations API
Facebook Insights API
Facebook Media API
Facebook Pages API
Facebook Phone Numbers API
Where this information came from

This is an independent, third-party profile of Facebook Messages API, published by API Evangelist. We do not operate, host, resell, or support these APIs, and we are not affiliated with or endorsed by the company unless stated above. Everything here is built from publicly available information — the company's own site, developer portal, documentation, public repositories, and the specifications it publishes for public use. Nothing is obtained by breaching a system, defeating an access control, or using credentials.

The Kin Score and Agent Readiness rating are independently calculated assessments of a company's public API artifacts, scored against a published rubric. They are not certifications, endorsements, security assessments, or audits.

Corrections, re-scores, and removal are free — no partnership or purchase required, and you do not need to justify the request. A removed company is recorded as unrated, never scored zero for having asked. Acknowledgement within one business day; removal within two.

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