Use your GHL API credentials to authorize requests. Generate an API key or OAuth token, and include it in the Authorization header for each call to the Contacts API.
To connect Mercury with the Contacts API, register your app, select the appropriate scopes, and securely store the resulting tokens. Start with read-only access and expand as needed.
Core endpoints include: 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, endpoints with write capabilities: 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.
Trigger: a new contact is created in Mercury, initiating a create in the Contacts API.
Actions: create or update the contact in Contacts API, create related tasks, and attach initial notes.
Methods: POST /contacts/ to create a contact, PUT /contacts/:contactId to update, POST /contacts/:contactId/tasks to add tasks.
Key fields: contactId, name, email, phone, task titles.
Trigger: contact details are updated in Mercury, triggering a fetch from the Contacts API.
Actions: pull latest contact data and reflect changes in Mercury.
Methods: GET /contacts/:contactId, GET /contacts/:contactId/notes.
Key fields: contactId, name, status.
Trigger: updates to tasks in Contacts API trigger Mercury actions.
Methods: PUT /contacts/:contactId/tasks/:taskId, PUT /contacts/:contactId/notes.
Key fields: contactId, taskId, status, notesId.
No-code setup: use prebuilt triggers and actions to connect Mercury with the Contacts API without writing a line of code.
Centralized data: a single view of contacts, tasks, notes, and appointments in one place.
Faster automations: reduce manual data entry and improve accuracy.
This glossary covers core terms used in this guide and how they relate to the integration.
Application Programming Interface: a set of endpoints you call to read or modify data.
A specific URL path that performs an action when requested.
OAuth tokens grant scoped access without sharing user credentials; store tokens securely.
Event-driven notifications that trigger automations in response to data changes.
Automatically create contacts in Contacts API from Mercury leads and assign follow-up tasks to your team.
Push Mercury case progress to Contacts API and attach notes as the journey advances.
Archive stale contacts or tasks from Contacts API and summarize activity in Mercury.
Register your Mercury app in the GHL developer portal, obtain an API key, and set your redirect URI.
Select the required scopes (contacts.readonly) and map endpoints to Mercury actions with your data schema.
Run tests, verify data integrity, and enable automated sync across systems.
No coding is required for basic setups thanks to prebuilt triggers and actions. You can connect Mercury to the Contacts API using a no-code workflow builder and test common scenarios quickly. For more advanced automations, scripting can be added, but it is not mandatory for standard use. Two: You can also leverage ready-made templates that cover contact creation, task assignment, and note synchronization to get started in minutes.
The available endpoints include a comprehensive set for reading and writing contacts, tasks, notes, and appointments such as GET /contacts/:contactId, GET /contacts/:contactId/tasks, POST /contacts/, PUT /contacts/:contactId, POST /contacts/:contactId/tasks, and more. This page focuses on read-only scopes by default, but write-capable endpoints are described for use when you authorize broader access. Two: Map these endpoints to Mercury actions to tailor data flows to your business processes.
Authentication uses an API key or OAuth token placed in the Authorization header for each request. In the Mercury setup, you register your app to obtain client credentials, choose the scopes (start with contacts.readonly), and securely store tokens. Two: When tokens expire, refresh tokens via the standard OAuth flow to keep integrations running without interruption.
Yes, with write-enabled credentials you can create and update contacts, tasks, and notes via the Contacts API. Ensure your token has the appropriate scopes and that the Mercury workflow includes proper error handling and idempotent operations to avoid duplicate records. Two: Always test in a sandbox or staging environment before going live.
Real-time syncing depends on your workflow design. Read operations (GET endpoints) can be near real-time, while writes may occur on trigger events or scheduled syncs. Two: Use webhooks or polling intervals to balance latency and API rate limits for optimal data freshness.
Error handling is supported through standard API responses and built-in retry logic in many no-code builders. You should log failed responses, map error codes to actionable steps, and implement backoff strategies for transient issues. Two: Consider setting up alerting when an error threshold is reached.
Endpoint documentation is available in the developer portal and within the integration guide. You can review specific paths like /contacts, /contacts/:contactId/tasks, and /contacts/:contactId/notes to tailor your data flows. Two: For additional endpoints or updated features, check the API reference and release notes regularly.
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