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LinkedIn API

LinkedIn Messaging API

List conversations, read message history, and reply to LinkedIn messages programmatically. PostPeer gives you one unified endpoint and handles OAuth and token refreshes for you.

  • List conversations with participants and last message
  • Load full message history for any conversation
  • Reply to professional conversations from one endpoint
  • OAuth and token refreshes handled for you
Start Posting for FreeView Docs
No credit card required.
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

How It Works

Add social media to your product in three steps.

01

Get Your API Key

Sign up and get your API key instantly — no sales calls, no complex onboarding.

02

Integrate in Minutes

A single endpoint to post, schedule, and manage content. Drop it into your product and go.

03

Your Users Post Everywhere

Your product now supports every major social platform — without you maintaining a single integration.

API Response Format

Clean, structured JSON that's easy to parse and integrate

Request

POST
curl "https://api.postpeer.dev/v1/messages?platform=linkedin&accountId=acc_li_567&limit=20" \
  -H "x-access-key: your-api-key"

Response

JSON
{
  "success": true,
  "selfId": "urn:li:person:AbC123",
  "selfUsername": "Your Brand",
  "conversations": [
    {
      "id": "urn:li:conversation:2233445566",
      "participants": [
        {
          "id": "urn:li:person:XyZ789",
          "name": "Jane Doe",
          "username": "jane-doe",
          "profilePictureUrl": "https://media.licdn.com/dms/image/..."
        },
        {
          "id": "urn:li:person:AbC123",
          "name": "Your Brand",
          "username": "yourbrand",
          "profilePictureUrl": "https://media.licdn.com/dms/image/..."
        }
      ],
      "lastMessage": {
        "id": "urn:li:message:6900000000000000001",
        "text": "Thanks for connecting, can we set up a call?",
        "from": {
          "id": "urn:li:person:XyZ789",
          "name": "Jane Doe"
        },
        "timestamp": "2026-08-05T16:40:00Z"
      },
      "updatedTime": "2026-08-05T16:40:00Z"
    }
  ],
  "nextCursor": "QVFIUl9..."
}

Everything You Need for LinkedIn Messaging

Read and reply to professional conversations without wrangling the LinkedIn API. List conversations, load history, and send replies from one endpoint.

List Conversations

Fetch conversations for a connected LinkedIn account with each participant name, headline, and profile picture, plus the most recent message and updated time.

Read Message History

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

Send Replies

Reply to a contact with one call. The response returns the sent message ID so you can track delivery and reconcile it against your CRM.

OAuth and Refresh Handled

Your users connect their LinkedIn account through PostPeer's OAuth flow. PostPeer manages tokens and refreshes so your integration keeps working without manual re-auth.

Build Your Own Inbox

Everything the PostPeer dashboard inbox uses is available through the API, so you can build a branded inbox or route conversations into your sales and support tooling.

One Endpoint Across Platforms

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

More Platform APIs

InstagramFacebookTwitter / XTikTok

Frequently Asked Questions

Ready to Add Social Media to Your Product?

One API. Every platform. Start building with free credits.

Start Posting for FreeNo credit card required.
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