Access to the Contacts API requires valid credentials with the appropriate scope (for example, contacts.readonly). Include your API key or OAuth token in the Authorization header for every request and rotate credentials regularly.
Register Wati as an application in your GHL account to receive client credentials, configure the redirect URI for OAuth, and grant the necessary scopes. Use these credentials to securely sign requests.
1) GET /contacts/:contactId 2) GET /contacts/:contactId/tasks 3) GET /contacts/:contactId/tasks/:taskId 4) GET /contacts/:contactId/notes 5) GET /contacts/:contactId/notes/:id 6) GET /contacts/:contactId/appointments 7) GET /contacts/ 8) GET /contacts/business/:businessId 9) scopes: contacts.write (permission to modify contacts) 10) POST /contacts/ 11) PUT /contacts/:contactId 12) DELETE /contacts/:contactId 13) POST /contacts/:contactId/tasks 14) PUT /contacts/:contactId/tasks/:taskId 15) PUT /contacts/:contactId/tasks/:taskId/completed 16) DELETE /contacts/:contactId/tasks/:taskId 17) POST /contacts/:contactId/tags
When a contact is created or updated in Wati, fetch the contact data from the Contacts API to keep records in sync.
Update Wati contact fields with API data and create or synchronize related tasks for that contact.
GET /contacts/:contactId and GET /contacts/:contactId/tasks
contactId, taskId
A new lead in Wati triggers creation of a corresponding contact in the Contacts API.
Create the contact via POST /contacts/ and add notes with POST /contacts/:contactId/notes.
POST /contacts/ and POST /contacts/:contactId/notes
name, email, phone, notes
A task completed in Wati should be reflected as completed in the Contacts API.
Call PUT /contacts/:contactId/tasks/:taskId/completed to update the status in GHL.
PUT /contacts/:contactId/tasks/:taskId/completed
contactId, taskId
Automate data flows between Wati and GHL without writing a line of code.
Keep contact data synchronized across your CRM, helpdesk, and messaging channels in real time.
Reduce manual data entry and accelerate agent workflows with automated actions.
This glossary clarifies terms used in this guide and how they relate to Wati and the GHL Contacts API.
The REST API provided by your GHL account to programmatically access and manage contacts, notes, tasks, appointments, and related resources.
A specific URL path that performs a defined operation, such as retrieving a contact or creating a note.
The process of proving identity to access the API, typically using API keys or OAuth tokens.
A callback mechanism where one app notifies another of events in real time.
Set up a real-time sync so new or updated contacts in Wati automatically create or update corresponding contacts in GHL.
Trigger a follow-up task or note in GHL when a Wati lead engages to move it toward opportunity.
Automatically tag contacts in GHL based on chat topics or sentiment detected in Wati.
In GHL, locate or generate an API key and note its scope (for example, contacts.readonly).
Register Wati as an app, set the OAuth redirect URL, and grant required permissions.
Make test calls, verify responses, and review logs to ensure data flows correctly.
The Contacts API lets you read contact data (name, email, phone) and fetch related items like tasks, notes, and appointments. In this Wati integration, you can pull data to keep Wati records up to date and trigger workflows based on contact changes. You can also use endpoints to align data across apps for consistent customer history. Use the provided endpoints to build automations such as syncing new contacts, retrieving tasks for follow-up, or attaching notes from Wati into GHL for a complete activity trail.
Authentication is typically done via an API key or OAuth token. Ensure the token has the necessary scope (for example, contacts.readonly or contacts.write) and include it in the Authorization header of every request. Rotate credentials regularly and monitor access logs for unusual activity. Always start with a least-privilege approach and grant only the scopes required for your integration.
Useful endpoints for Wati workflows include GET /contacts/:contactId to fetch contact details, GET /contacts/:contactId/tasks to pull related tasks, and POST /contacts/ to create new contacts. For updating work items, endpoints like PUT /contacts/:contactId/tasks/:taskId or POST /contacts/:contactId/notes help you keep records synchronized and actionable within Wati.
No-code setup is possible if you use integration platforms or automations that support GHL and Wati connections. However, a basic understanding of API concepts helps you design more reliable flows and troubleshoot issues when endpoints return errors or when data mismatches occur.
Common errors include invalid credentials, expired tokens, or missing scopes. Check Authorization headers, verify the token’s scope, and confirm the endpoint path. If you hit rate limits, implement exponential backoff and cache frequently requested data where appropriate.
Yes. You can sync notes and tasks by calling POST /contacts/:contactId/notes and PUT /contacts/:contactId/tasks/:taskId to reflect changes. Designing idempotent flows helps prevent duplicate records and keeps data consistent across Wati and GHL.
Due to high volume, we will be upgrading our server soon!
Complete Operations Catalog - 126 Actions & Triggers
