Authenticate to the Contacts API using OAuth 2.0 or an API Key with the scope contacts.readonly to access contact data safely.
Configure OAuth 2.0 or an API Key in the App Connector to securely access Contacts data from GHL, with appropriate scopes enabled for reading and updating records.
GET /contacts/:contactId | GET /contacts/:contactId/tasks | GET /contacts/:contactId/tasks/:taskId | GET /contacts/:contactId/notes | GET /contacts/:contactId/notes/:id | GET /contacts/:contactId/appointments | GET /contacts/ | GET /contacts/business/:businessId | contacts.write | POST /contacts/ | PUT /contacts/:contactId | DELETE /contacts/:contactId | POST /contacts/:contactId/tasks | PUT /contacts/:contactId/tasks/:taskId | PUT /contacts/:contactId/tasks/:taskId/completed | DELETE /contacts/:contactId/tasks/:taskId | POST /contacts/:contactId/tags
Authenticate via OAuth 2.0 and set triggers to respond to new or updated contacts in GHL.
Actions can create or update a contact, add notes, or attach tasks from LMN.
Example path after auth: GET /contacts/:contactId to fetch a contact; triggers can be built from GET endpoints.
Key fields include contactId, email, firstName, lastName, phone, tags.
Use API Key authentication to poll GET /contacts/ and GET /contacts/:contactId for changes.
Actions include create, update, and delete on contacts; plus create tasks and notes.
Common REST paths live under /contacts and related resources such as /contacts/:contactId/tasks and /contacts/:contactId/notes.
Key fields: contactId, businessId, email, name, phone.
Configure webhooks to push real-time contact updates to the Zapier App Connector.
Process incoming webhook payloads to create or update contacts, notes, or tasks in LMN.
Webhook endpoint example: POST /webhooks/contacts.updated
Fields in webhook: contactId, event, timestamp, payload.
Automate data flow between GHL and 3rd-party apps without writing code.
Drag-and-drop workflow builder makes LMN automations quick to implement.
Scale data sync across endpoints with reliable, maintainable automations.
This glossary covers API, OAuth, API Key, and webhooks, plus how they come together in the LMN-Contacts integration with the Zapier App Connector.
An API is a set of rules that lets software programs communicate. The GHL Contacts API exposes endpoints to read, create, update, and delete data for contacts, tasks, notes, and more.
OAuth 2.0 is an authorization framework enabling apps to access user data with permission, using tokens rather than passwords.
An API key is a credential used to authenticate requests to the API, scoped as needed.
A webhook is an HTTP callback that delivers data in real time when a specific event occurs.
Auto-create a contact in GHL when a new lead fills a form in your CRM, then assign tasks in LMN.
Sync task updates and notes from GHL to your project tools through Zapier automations.
Send alerts to sales and support channels when key contact milestones occur.
Open the App Connector, select the Contacts API, and configure authentication with OAuth 2.0 or an API Key.
Map fields and set up triggers and actions using the endpoints listed above.
Run tests, validate mappings, and deploy to LMN workflows.
You can integrate LMN with the Contacts API without writing code by using the Zapier App Connector. It lets you trigger actions and map fields between GHL and your apps. Start by authenticating and choosing endpoints that fit your workflow. Then test thoroughly to ensure data flows as expected. If you get stuck, use Zapier’s built-in testing tools and consult the endpoint docs for field mappings.
No-code is indeed possible with the App Connector’s visual editor, which lets you connect endpoints and actions through a drag-and-drop interface. For advanced needs, you can still add code steps in Zapier if you require custom logic or data transformations.
OAuth 2.0 is recommended for secure, long-term integrations, while API Key offers a simpler setup for quick proofs of concept. Choose based on security requirements and your team’s capabilities; you can start with API Key and migrate to OAuth as needed.
Yes, you can fetch all contacts using GET /contacts/, with pagination as needed. Ensure your authentication scope allows reading all contact data. Be mindful of rate limits and implement paging in your workflow.
To create or update a contact, use POST /contacts/ or PUT /contacts/:contactId and map the required fields from your source system. Utilize triggers or actions to sync changes and keep data consistent across apps.
Rate limits apply to API calls; plan your polling frequency accordingly and implement retries with backoff. Consult GHL documentation for current quotas and best practices.
Common authentication and endpoint issues include invalid tokens, missing scopes, or incorrect endpoint paths. Use the App Connector test tool, verify scopes, and review logs to diagnose problems quickly.
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