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Facebook Messaging API

List conversations, read message history, and reply to Facebook Messenger threads programmatically. PostPeer gives you one unified endpoint and handles the Meta Graph API and App Review.

  • List Page conversations with participants and last message
  • Load full message history for any conversation
  • Reply to customers within Meta's 24-hour messaging window
  • No Meta developer app or App Review on your side
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POST https://api.postpeer.dev/v1/posts
{ "platforms": ["twitter", "linkedin"], "content": "Hello world!" }
Published
2 platforms
TwitterLinkedIn
All posts delivered
Scheduled
queue
12
Queued
847
Sent
Next: in 15 min
Platforms
connected
XLIFBTT
One API, every platform
DF

"I was up and running on six different platforms in under 30 minutes. Strongly recommend!"

David Flor, Founder at Darklight Interactive

Divanshu KhatterMarketing Manager at Sembark

"Couldn't figure out the official Pinterest API. PostPeer was smooth. Using it daily."

Divanshu Khatter, Marketing Manager at Sembark

Het TikawalaFounder at Kalizzle AI Studio

"Great integration experience. Jonathan ships fixes within hours. Mad respect for the speed."

Het Tikawala, Founder at Kalizzle AI Studio

Add Social Media to Your Product in Three Steps

Connect once, then publish, schedule, and read data through the same API.

01

Get Your API Key

Sign up and get your API key instantly. No sales calls or complicated setup.

02

Integrate in Minutes

Connect once to PostPeer to publish, schedule, analyze, manage comments, and handle messages.

03

Support Every Major Platform

Give your users access to major social platforms without building and maintaining each integration yourself.

New to PostPeer? Read the getting started guide

One Request. Structured Response.

Clean, predictable JSON that's easy to parse and integrate.

POSTRequest
curl "https://api.postpeer.dev/v1/messages?platform=facebook&accountId=acc_fb_page_456&limit=20" \
  -H "x-access-key: your-api-key"
JSONResponse
{
  "success": true,
  "selfId": "1029384756",
  "selfUsername": "Your Brand",
  "conversations": [
    {
      "id": "t_100000000000001",
      "participants": [
        {
          "id": "2233445566",
          "name": "Jane Doe",
          "username": "jane.doe",
          "profilePictureUrl": "https://platform-lookaside.fbsbx.com/..."
        },
        {
          "id": "1029384756",
          "name": "Your Brand",
          "username": "yourbrand",
          "profilePictureUrl": "https://platform-lookaside.fbsbx.com/..."
        }
      ],
      "lastMessage": {
        "id": "m_aWdfbXNnXzEyMw",
        "text": "Is this still in stock?",
        "from": {
          "id": "2233445566",
          "name": "Jane Doe"
        },
        "timestamp": "2026-08-05T16:40:00Z"
      },
      "updatedTime": "2026-08-05T16:40:00Z"
    }
  ],
  "nextCursor": "QVFIUl9..."
}

Everything You Need for Facebook Messenger

Read and reply to Messenger conversations without managing Meta's Graph API. List conversations, load history, and send replies from one endpoint.

List Conversations

Fetch conversations for a connected Facebook Page with each participant name and profile picture, plus the most recent message and updated time. Paginate through the inbox with a cursor.

Read Message History

Load the messages in a Messenger thread, paginated, each with the sender and a timestamp. Rebuild the full conversation on your side.

Send Replies

Reply to a customer with one call. The response returns the sent message ID so you can track delivery against your own records.

24-Hour Window Handled

Meta only allows standard replies within 24 hours of the user's last message. That is a platform rule, not ours, and the API surfaces the failure clearly when the window has closed.

Build Your Own Inbox

Everything the PostPeer dashboard inbox uses is available through the API, so you can build a branded support inbox or wire Messenger into your own CRM and help desk.

One Endpoint Across Platforms

The Facebook Messages surface uses the same `/v1/messages` request and response shape as every other PostPeer messaging endpoint. Add it to your inbox without a new integration.

Beyond Facebook: Every Supported Platform

Start with Facebook, then reach every other network through the same API.

Instagram API

Handle Instagram conversations.

You're here

Facebook API

Handle Facebook conversations.

Twitter / X API

Handle Twitter / X conversations.

LinkedIn API

Handle LinkedIn conversations.

TikTok API

Handle TikTok conversations.

Add More Social Capabilities

Use the same connected accounts to schedule, analyze, manage comments, and handle conversations.

Posting API

Publish to every network through one endpoint.

Explore

Scheduling API

Queue and deliver posts at the perfect time.

Explore

Analytics API

Pull engagement and reach metrics into your product.

Explore

Comments API

Read, reply to, hide, and manage comments.

Explore
Try PostPeer API for FreeView All Documentation

Frequently Asked Questions

Power Your Next Project With a Unified Social Media API

Give your users posting, scheduling, analytics, and engagement features through one API your team can maintain.

Start with 20 free credits. No credit card required.

Start Posting for FreeRead the Docs