Authenticate requests to the Contacts API using OAuth 2.0 and API keys. Start by creating an integration in your GHL account to obtain client credentials, then exchange them for access tokens and refresh tokens.
Your app should securely store and rotate credentials, using the same OAuth flow or API keys provided by the integration to access the Contacts API.
GET /contacts/:contactId — Retrieve a single contact; GET /contacts/:contactId/tasks — Retrieve tasks for a contact; GET /contacts/:contactId/tasks/:taskId — Retrieve a specific task; GET /contacts/:contactId/notes — Retrieve notes for a contact; GET /contacts/:contactId/notes/:id — Retrieve a specific note; GET /contacts/:contactId/appointments — Retrieve a contact’s appointments; GET /contacts/ — List all contacts; GET /contacts/business/:businessId — List contacts by business; contacts.write — permission to write data; POST /contacts/ — Create a new contact; PUT /contacts/:contactId — Update a contact; DELETE /contacts/:contactId — Delete a contact; POST /contacts/:contactId/tasks — Create a task for a contact; PUT /contacts/:contactId/tasks/:taskId — Update a task; PUT /contacts/:contactId/tasks/:taskId/completed — Mark a task complete; DELETE /contacts/:contactId/tasks/:taskId — Delete a task; POST /contacts/:contactId/tags — Tag a contact.
Trigger: When a new contact is created in your app, automatically create the corresponding contact in the Contacts API.
Actions: Create contact in Contacts API; optionally attach default tasks or notes.
POST /contacts/
name, email, phone
Trigger: Retrieve tasks for a given contact from the Contacts API.
Actions: GET /contacts/:contactId/tasks and map to your task schema.
GET /contacts/:contactId/tasks
contactId
Trigger: Attach notes to a contact when notes are created.
Actions: POST /contacts/:contactId/notes to create notes; GET /contacts/:contactId/notes to read notes.
POST /contacts/:contactId/notes
contactId, content
Unified contact data across platforms allows precise segmentation and personalized messaging.
Automated workflows sync tasks and notes as contacts update, reducing manual data entry.
Faster onboarding and quicker value realization with a centralized API integration.
This glossary explains core concepts and processes you’ll use when integrating the Contacts API with your app.
A defined set of rules that allows software applications to communicate with each other.
An authorization framework that enables apps to obtain access tokens on behalf of users.
A specific URL in an API that performs a defined action.
The process of verifying identity to access a resource.
Pull social data or activity summaries into contact records automatically.
Create tasks from new engagements and nurture campaigns.
Attach notes with summaries of interactions to each contact.
Obtain credentials and implement OAuth 2.0 flow.
Call endpoints to fetch contacts, tasks, and notes; map fields to your schema.
Set up automation rules and webhooks to keep data synchronized.
To use the API you’ll need OAuth 2.0 tokens and API keys. Start by creating an integration in your GHL account to obtain client credentials, then exchange them for access tokens and refresh tokens. Tokens expire and require refresh; implement token refresh logic. Store credentials securely using server-side vaults and never expose tokens in client code. Use HTTPS for all requests and follow least-privilege scopes: contacts.readonly for read-only access.
You can access endpoints to manage contacts and their related resources: GET /contacts/:contactId, GET /contacts/:contactId/tasks, GET /contacts/:contactId/notes, POST /contacts/, PUT /contacts/:contactId, and DELETE /contacts/:contactId. For listing all contacts, use GET /contacts/ and for business contexts, GET /contacts/business/:businessId. These endpoints cover creating, reading, updating, and deleting contacts as well as their tasks and notes.
Store credentials securely on the server side; avoid embedding secrets in client code. Use environment variables or a secrets manager, and rotate credentials regularly. Implement strict access controls and monitor usage. Consider using token refresh and automatic renewal mechanisms to maintain seamless access.
Yes. You can create and update contacts and related resources via POST and PUT endpoints. Examples include POST /contacts/ to create a contact, PUT /contacts/:contactId to update, and PUT /contacts/:contactId/tasks/:taskId to update tasks. Use appropriate payloads to map your app’s data model to the API fields.
To fetch notes and tasks for a contact, use GET /contacts/:contactId/notes and GET /contacts/:contactId/tasks. You can combine results or paginate as needed. Store note and task identifiers to reference updates or deletions later.
The API enforces rate limits to protect reliability. If you approach the limit, implement exponential backoff and retries. For higher quotas, request increased limits through your account team or support and optimize calls by batching or caching responses when appropriate.
Webhooks notify your app of changes to contacts, tasks, and notes. Configure your webhook URL in the integration, verify signatures on inbound requests, and implement retry logic for failed deliveries to ensure data stays synchronized.
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