Authentication

All requests to the Linq Partner API require authentication via a bearer token in the Authorization header. The official SDKs handle authentication automatically.

Include your API token in every request:

Authorization: Bearer YOUR_TOKEN

Your token determines:

• Which phone numbers you can send from
• Which data you can access (chats, messages, attachments)
• Your rate limits and daily message quotas

Generate a token yourself from the Linq dashboard:

1. Go to dashboard.linqapp.com/api-tooling.
2. API → Overview
3. Click Generate new token.

curl https://api.linqapp.com/api/partner/v3/chats \
  -H "Authorization: Bearer $LINQ_API_KEY" \
  -H "Content-Type: application/json"

import LinqAPIV3 from '@linqapp/sdk';

const client = new LinqAPIV3({
  apiKey: process.env.LINQ_API_KEY, // reads LINQ_API_V3_API_KEY by default
});

import os
from linq import LinqAPIV3

client = LinqAPIV3(api_key=os.environ["LINQ_API_KEY"])

• Use environment variables — Never hardcode tokens in source code
• Never commit tokens — Add .env to .gitignore
• Rotate regularly — Request new tokens periodically from your Linq representative
• Limit access — Only share tokens with team members who need them
• Use separate tokens — Use different tokens for development and production

See Error Codes for the complete error reference and the API Reference for endpoint specifications.