Requests to the GHL Contacts API are secured with an API key or OAuth token. Use the scope contacts.readonly to access contact data and respect rate limits.
To connect MailerLite Classic, generate an API key from your account settings and include it in Authorization headers for every request.
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
Trigger when a new contact is created in GHL to create or update the corresponding contact in MailerLite Classic.
Actions: map fields (email, name, custom fields), assign tags, and ensure opt-in status is synchronized.
MailerLite API: POST /contacts/ to create or update a contact.
Key fields: email (mandatory), name, custom fields; unique identifier: contactId in GHL maps to MailerLite contactId or email.
Trigger when a contact is updated in GHL to refresh data in MailerLite Classic.
Actions: update MailerLite contact data, sync notes and tags as needed.
MailerLite API: PUT /contacts/:contactId
Key fields: contactId (GHL) maps to MailerLite contact resource; email, name as fields.
Trigger when notes or tasks are created in GHL to mirror in MailerLite.
Actions: create corresponding notes or tasks in MailerLite or store as custom fields for context.
MailerLite API: POST /contacts/:contactId/tasks or POST /contacts/:contactId/notes
Key fields: contactId, taskId or noteId
Automate data synchronization without writing code, using no-code automations and webhooks.
Keep contact data consistent across platforms, reducing manual updates.
Improve marketing automation with real-time updates and targeted campaigns.
A quick glossary of the key elements and processes used in this guide to help you implement the integration.
A set of rules and endpoints that allow software to communicate.
A callback mechanism that notifies another system when an event occurs.
The process of proving identity to access APIs securely.
A specific URL in an API that performs an action or returns data.
Set up a workflow that subscribes new GHL contacts to a MailerLite newsletter and applies tags for segmentation.
When a contact record is updated in GHL, push the changes to MailerLite so campaigns stay aligned.
Capture GHL activity as tasks or notes in MailerLite to provide context in your campaigns.
Obtain your GHL API key and your MailerLite Classic API key, and store them securely.
Map fields between GHL and MailerLite and choose the endpoints you will use.
Run test requests to verify data flow and adjust mappings as needed.
You can sync essential fields such as email, name, and phone with the Contacts API. Use custom fields for more data and map fields consistently.
No-code options are supported via automations and webhooks, making it easy to set up integrations without programming.
Store API keys securely, rotate them periodically, and use HTTPS with encryption for all requests.
For contacts, useful endpoints include GET /contacts/:contactId, POST /contacts/, and PUT /contacts/:contactId for syncing.
Yes. Use scheduled automations or webhooks to trigger syncs at regular intervals.
Rate limits vary by plan. Plan accordingly and batch requests where possible.
API documentation is available on the GHL developer portal and MailerLite API references.
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