GoHighLevel API Integrations: Connecting GHL to Any Platform Your Clients Use

The GoHighLevel API reaches what Zapier and native integrations cannot. Push leads from a custom website form the instant they submit, pull live pipeline data into Power BI, sync a bespoke booking system, or route messages through a compliance-approved SMS provider. At GHL Prime we build custom GHL API integrations every week. This guide covers what the API can do, how authentication works, the endpoints you will use most, and four real-world integration patterns you can model from.

GHL API Basics — What You Need to Know

The GoHighLevel API is a standard REST API that speaks JSON. Every request goes to the base URL https://services.leadconnectorhq.com and is authenticated with a Bearer token — either an Agency key or a Location (sub-account) key, depending on the scope of what you are building.

• Authentication: pass your token in the Authorization: Bearer YOUR_API_KEY header on every request.
• Rate limit: roughly 100 requests per 10 seconds per location. Build retry-with-backoff logic and batch where you can.
• Versions: there is a v1 (older, legacy) and a v2 (current, recommended). Always build new GHL API integrations against v2.
• Docs: the full reference lives at developers.gohighlevel.com.

Because it is plain REST and JSON, you can call it from any language or platform — Node.js, Python, PHP, a serverless function, or a no-code HTTP step inside a workflow.

Getting Your GHL API Key

There are two kinds of keys, and choosing the right one matters for both security and scope.

• Agency key: in your agency dashboard go to Settings > Agency > API Keys > Create. This key can act across multiple sub-accounts.
• Location key: open the specific sub-account, then go to Settings > API > Create. This key is scoped to that one client.

Use location keys for single-client integrations — they limit blast radius if a key ever leaks. Reserve the agency key for cross-account tooling that genuinely needs to touch many sub-accounts at once.

The 10 Most Used GHL API Endpoints

Nearly every integration we build leans on the same handful of endpoints. Here are the ten you will reach for most.

Endpoint	Method	What it does
/contacts	GET	List contacts with filters and search
/contacts	POST	Create a new contact
/contacts/{id}	PUT	Update an existing contact
/contacts/{id}/tags	POST	Add tags to a contact
/contacts/{id}/notes	POST	Add a note to a contact
/pipelines	GET	List pipelines and their stages
/opportunities	POST	Create a deal in a pipeline
/opportunities/{id}	PUT	Move a deal to another stage
/conversations/messages	POST	Send an SMS or email
/calendars/appointments	POST	Create an appointment

Real Integration 1 — Custom Website Form to GHL Contact

The most common request: a client has a custom website form (not a GHL form) and wants every submission to create a GHL contact instantly. With the GoHighLevel API you POST the form data straight to /contacts.

// Runs on your backend / serverless function — NOT in the browser
const response = await fetch('https://services.leadconnectorhq.com/contacts', {
  method: 'POST',
  headers: {
    'Authorization': 'Bearer YOUR_API_KEY',
    'Content-Type': 'application/json',
    'Version': '2021-07-28'
  },
  body: JSON.stringify({
    firstName: 'Jane',
    lastName: 'Doe',
    email: 'jane@example.com',
    phone: '+15551234567',
    tags: ['website-lead'],
    source: 'Website Contact Form'
  })
});

const contact = await response.json();

Warning: never expose your API key in frontend JavaScript — anyone can read it in the browser. Always proxy the request through a backend route or serverless function so the key stays server-side.

Real Integration 2 — Property Portal Webhook to GHL

Property portals such as Rightmove, Zillow, or CoStar fire a webhook to your server every time someone enquires on a listing. You build a small receiver — a Next.js API route or an Express endpoint — to turn that enquiry into a fully tagged GHL lead with a deal attached.

1. Receive the inbound POST from the portal.
2. Extract the lead data (name, email, phone, property reference).
3. Create the contact by POSTing to /contacts.
4. Tag it via /contacts/{id}/tags with portal-lead and property-ref-{id} so reporting stays clean.
5. Create a deal by POSTing to /opportunities named "New Enquiry" in the right pipeline stage.
6. Return 200 so the portal knows delivery succeeded.

This gives the client a real-time lead flow with full attribution — something no native integration offers for a niche portal.

Real Integration 3 — Power BI / Google Data Studio to GHL Data

Enterprise clients often want GHL pipeline data inside their own BI dashboard. The clean approach is a scheduled export rather than a live connection.

• Run a cron job daily at midnight.
• Fetch all active opportunities, paginating through the results to respect the rate limit.
• Transform the JSON into a flat CSV (one row per deal, stage and value as columns).
• Push that file to Google Sheets or Azure Blob Storage.
• Point Power BI or Google Data Studio at that source as its dataset.

The BI tool reads from a stable, pre-shaped source — so dashboards stay fast and you never hammer the GHL API during business hours.

Real Integration 4 — GHL to External SMS Platform

Some clients must send SMS through Twilio, MessageBird, or another approved carrier for compliance reasons rather than GHL's built-in SMS. You can route messages out while keeping GHL as the system of record.

1. In GHL, add a Workflow with a Webhook action that fires when a message should go out.
2. The webhook hits your custom endpoint, sending the contact and message body.
3. Your endpoint formats the payload for the external SMS API and sends it.
4. It then logs the delivery status back to the GHL contact as a note via /contacts/{id}/notes.

The agent sees a clean audit trail inside GHL while the actual send happens on the compliant platform.

GHL Webhooks — Receiving Events From GHL

Beyond calling the API, you can have GHL push events to you in real time. Go to Location Settings > Webhooks > Add Webhook URL and point it at your endpoint. Available events include:

• ContactCreated, ContactUpdated, ContactDeleted
• OpportunityCreated, OpportunityUpdated, OpportunityStageChanged
• AppointmentCreated, AppointmentUpdated
• FormSubmitted, SurveySubmitted
• InboundMessage, OutboundMessage
• InvoicePaid

The golden rule for webhook receivers: always return a 200 quickly. If you need to do heavy work, acknowledge the event first and process it asynchronously on a queue so GHL does not time out and retry.

When to Hire a GHL Developer vs Using Zapier

Zapier is excellent for the right job — but it has hard limits. Use this as a quick decision guide.

Use Zapier when…	Use custom API development when…
A native integration already exists	No native integration exists for the platform
You need it working today	You need real-time events, not polling
Volume is under 1,000 tasks per month	You have high volume that makes per-task pricing painful
The data maps one-to-one	You need complex transformation or branching logic
No special compliance constraints	Security or compliance requires data stays in your control

If you are stuck on the right side of that table, that is exactly where custom GHL API development pays for itself — and where the GHL Prime team lives.