To begin, create a GHL API key or OAuth token and grant access to contacts, tasks, notes, and appointments used by ManyContacts.
In ManyContacts, generate an API credential and configure the redirect URL in GHL, then link the accounts so data can flow between systems.
Key endpoints include: GET /contacts/:contactId to fetch a contact; GET /contacts/:contactId/tasks to list tasks; GET /contacts/:contactId/tasks/:taskId to fetch a specific task; GET /contacts/:contactId/notes to list notes; GET /contacts/:contactId/notes/:id to fetch a specific note; GET /contacts/:contactId/appointments to list appointments; GET /contacts/ to list contacts; GET /contacts/business/:businessId to fetch business-specific data; standard write and delete operations include POST /contacts/ to create a contact; PUT /contacts/:contactId to update a contact; DELETE /contacts/:contactId to delete a contact; POST /contacts/:contactId/tasks to add tasks; PUT /contacts/:contactId/tasks/:taskId to update tasks; PUT /contacts/:contactId/tasks/:taskId/completed to mark tasks complete; DELETE /contacts/:contactId/tasks/:taskId to remove tasks; POST /contacts/:contactId/tags to apply tags.
Trigger: When a contact is created or updated in ManyContacts, push the changes to the Contacts API to keep both systems in sync.
Actions: Upsert the contact in the Contacts API; also sync related tasks, notes, and appointments.
Method path examples: POST /contacts/ to create or PUT /contacts/:contactId to update.
Key fields: contactId, email, phone.
Trigger: Task updates in either system.
Actions: Create and update tasks via the Contacts API endpoints; reflect status changes back to ManyContacts.
Method path: POST /contacts/:contactId/tasks, PUT /contacts/:contactId/tasks/:taskId, PUT /contacts/:contactId/tasks/:taskId/completed, DELETE /contacts/:contactId/tasks/:taskId.
Key fields: contactId, taskId, status.
Trigger: Note or appointment updates.
Actions: Create notes and schedule appointments in the Contacts API and mirror in ManyContacts.
Method: GET /contacts/:contactId/notes, GET /contacts/:contactId/appointments, POST/PUT as needed.
Key fields: contactId, id (noteId), appointmentId.
Build powerful automations without writing code.
Launch CRM workflows quickly using visual triggers and actions.
Keep data consistent across platforms with real-time sync.
Definitions for API, endpoints, authentication, triggers, actions, and data fields used in this integration.
Application Programming Interface: a set of rules and protocols for building and integrating software applications.
A specific URL path in an API that performs a function or returns data.
The process of verifying identity and granting access to API resources (OAuth, API keys).
A way for an API to push data to another system in real time.
Create ready-to-use templates that sync new contacts, tasks, notes, and appointments between GHL and ManyContacts.
Define rules that minimize conflicts and ensure the latest data wins.
Use drag-and-drop steps to build cross-platform automation between GHL and ManyContacts.
Register your app in GHL, obtain client credentials, and set redirect URLs.
Grant access to contacts, tasks, notes, and appointments so data can flow both ways.
Run tests, validate data sync, and enable automation in production.
The Contacts API in GHL lets you access and manage contacts, tasks, notes, and appointments from ManyContacts. You can pull data for visibility or push updates to keep data in sync. This reduces manual entry and improves consistency across systems. In practice, you will set up triggers and actions that automatically create or update records in both platforms.
No-code is a core strength here. With Zapier-like automation and visual builders, you can connect ManyContacts to the Contacts API without writing code. You will configure authentication, choose triggers, and map fields to keep data aligned. If you need advanced logic, you can still leverage custom scripts, but many common workflows require no code.
For common tasks, start with: fetch contact data (GET endpoints), create or update contacts (POST/PUT), and manage tasks and notes (POST/PUT). The Endpoints section lists the most used paths you will implement in the automation. Always test with sample data to validate field mappings.
Data security is critical. Use OAuth or API keys, restrict scopes (domains and users), and enable audit logs. Data in transit should be encrypted, and you should rotate credentials regularly. Most platforms provide built-in security controls to protect access to contacts and notes.
Yes. You can test in a sandbox or staging environment by creating test contacts and tasks. Validate that triggers fire, data maps correctly, and that updates propagate without errors. Move to production after successful tests.
Handle errors with robust retries, backoff strategies, and clear error messages. Use status codes from the API to determine retry eligibility and implement idempotent operations where possible to avoid duplicate records.
API documentation is available in the GHL developer portal and the ManyContacts integration guide. For support, reach out to official channels or consult the knowledge base for step-by-step tutorials and troubleshooting tips.
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