How to Send a POST Request to HighLevel Without an Inbound Webhook
You can send POST requests directly to the HighLevel API without webhooks. You need an API token, the right endpoint, proper headers, and valid JSON. Use Postman, cURL, JavaScript, Python, or automation tools like Zapier and Make.
What You Will Need
Create a private integration, generate your token, identify your location ID, pick your endpoint, add headers and JSON data, send the request, check the response.
What Is a HighLevel API POST Request?
A POST request sends data to a HighLevel API endpoint. Depending on the endpoint, it can create a resource or perform another documented operation. You control when the data goes out. This is different from webhooks, where external systems send data to you automatically.
Never miss: What Kollab App Is GoHighLevel Using?
Working of HighLevel API
Your system sends a request with data. HighLevel receives it at an API endpoint. HighLevel processes the data. You get a response with success or an error code.
When to Use a POST Request
HighLevel API vs. Inbound Webhook: What’s the Difference?
HighLevel API (POST Request):
Your application sends data to HighLevel whenever you choose. You need API authentication. Full control over timing and data.
Inbound Webhook:
HighLevel receives data from external applications via your webhook URL. Automatic when events happen. Usually built-in integrations.
When to Use Each
Use API POST for: custom integrations, when you need complete control, building your own workflows.
Use inbound webhooks when an external system needs to send data into a HighLevel workflow through a webhook URL.
How to Authenticate a HighLevel API Request
HighLevel uses API tokens for authentication. Your token proves your system is authorized to make requests. Without it, you get a 401 error.
HighLevel API Authentication: Step by Step
Create a Private Integration
Generate Your API Token
- After creating the integration, you will see your access token
- Copy it immediately and save it somewhere secure
- Treat it like a password. Do not share it
API Scopes and Permissions
Your integration needs the right scopes to access specific features. Set only the permissions you actually need. For contact creation, make sure the integration has the contacts. Write scope.
Keeping Your API Credentials Secure
How to Structure a HighLevel API POST Request
A proper POST request has four parts: endpoint, HTTP method, headers, and body.
The Endpoint
This is the URL where your data goes. HighLevel API v3 uses endpoints structured as POST /contacts/, POST /orders/, etc. The base URL is https://services.leadconnectorhq.com. Different actions use different endpoints and may require different authentication mechanisms.
HTTP Method
For creating new resources, HighLevel uses POST. For updating existing resources, the documentation specifies the appropriate method (often PUT). Always check the specific endpoint documentation.
Authorization Header
Include this in every request: Authorization: Bearer your_token_here
Content-Type Header
Set this to application/json so HighLevel knows your data is JSON format.
JSON Request Body
The actual data you’re sending. Field names must match what HighLevel expects. All required fields must be included. Must be valid JSON.
How to Send a POST Request to the HighLevel API
Step 1: Create a Private Integration
Start in your HighLevel settings. Create a new private integration. Name it something that describes what you’re doing.
Step 2: Generate Your API Token
Copy your token from the integration. Save it securely. You will need this for every request.
Step 3: Get Your Location ID
Find your location ID in your HighLevel account. This is required for most API requests and identifies which location/account the data applies to.
Step 4: Choose the HighLevel API Endpoint
Find the right endpoint in the HighLevel API documentation for your action (contacts, orders, etc.). Copy the full endpoint path.
Step 5: Create the JSON Body
Write your data in proper JSON format. Include all required fields. Check syntax before sending.
Step 6: Send the Request
Use Postman, cURL, or code. Send it to the endpoint. Check the response.
Step 7: Check the Response
Check the HTTP status code. For creating a contact, HTTP 201 indicates success. Read the response body for the created resource or error details.
HighLevel API POST Request Example: Create a Contact
Endpoint
POST https://services.leadconnectorhq.com/contacts/
Headers
Authorization: Bearer your_access_token_here
Content-Type: application/json
JSON Request Body
{
“firstName”: “John”,
“lastName”: “Smith”,
“email”: “[email protected]”,
“phone”: “+13015551234”,
“locationId”: “YOUR_LOCATION_ID”,
“source”: “API”,
“tags”: [“potential client”, “contacted”]
}
The locationId is required. Replace YOUR_LOCATION_ID with your actual HighLevel location ID.
Success Response (HTTP 201)
{
“contact”: {
“id”: “seD4PfOuKoVMLkEZqohJ”,
“name”: “John Smith”,
“firstName”: “John”,
“lastName”: “Smith”,
“email”: “[email protected]”,
“phone”: “+13015551234”,
“locationId”: “YOUR_LOCATION_ID”,
“source”: “API”,
“tags”: [“potential client”, “contacted”],
“dateAdded”: “2025-01-15T10:30:00Z”
}
}
The response is wrapped in a contact object containing the created resource.
Error Response Example (HTTP 400 – Bad Request)
{
“error”: “validation_error”,
“message”: “Missing required field: locationId”,
“details”: {
“field”: “locationId”,
“issue”: “required”
}
}
The exact error structure can vary by endpoint. Use the returned error message and HighLevel documentation to identify and fix the problem.
Verify the Contact in HighLevel
How to Send a HighLevel API POST Request in Postman
Postman makes testing API requests simple without writing code.
Step 1: Create a POST Request
Open Postman. Create a new request. Select POST from the dropdown.
Step 2: Add the Endpoint URL
Paste your full endpoint URL into the URL field:
Step 3: Configure Authorization
Go to the Headers tab. Add Authorization: Bearer your_access_token_here
Step 4: Set Content Type
Add Content-Type: application/json. Postman usually does this automatically.
Step 5: Add the JSON Body
Click the Body tab. Select raw. Paste your JSON data, including your locationId. Check the syntax.
Step 6: Send and Test
Click Send. Watch the response panel for the status code and response data.
How to Send a HighLevel API POST Request With cURL
cURL lets you send requests from the terminal or scripts.
Basic Format
curl -X POST https://services.leadconnectorhq.com/contacts/ \
-H “Authorization: Bearer your_access_token_here” \
-H “Content-Type: application/json” \
-d ‘{
“firstName”: “John”,
“lastName”: “Smith”,
“email”: “[email protected]”,
“phone”: “+13015551234”,
“locationId”: “YOUR_LOCATION_ID”,
“source”: “API”,
“tags”: [“potential client”, “contacted”]
}’
Replace YOUR_LOCATION_ID with your actual location ID.
Flag Breakdown
How to Send a HighLevel API POST Request With JavaScript
Use the Fetch API to send requests from your application.
Basic Format
const token = process.env.GHL_API_TOKEN; // Store in environment variable
const locationId = process.env.GHL_LOCATION_ID; // Your location ID
fetch(‘https://services.leadconnectorhq.com/contacts/’, {
method: ‘POST’,
headers: {
‘Authorization’: `Bearer ${token}`,
‘Content-Type’: ‘application/json’
},
body: JSON.stringify({
firstName: ‘John’,
lastName: ‘Smith’,
email: ‘[email protected]’,
phone: ‘+13015551234’,
locationId: locationId,
source: ‘API’,
tags: [‘potential client’, ‘contacted’]
})
})
.then(response => response.json())
.then(data => console.log(‘Contact created:’, data))
.catch(error => console.error(‘Error:’, error));
Key Points
How to Send a HighLevel API POST Request With Python
Python’s requests library makes API calls straightforward.
Basic Format
import requests
import os
token = os.getenv(‘GHL_API_TOKEN’)
location_id = os.getenv(‘GHL_LOCATION_ID’)
url = ‘https://services.leadconnectorhq.com/contacts/’
headers = {
‘Authorization’: f’Bearer {token}’,
‘Content-Type’: ‘application/json’
}
data = {
‘firstName’: ‘John’,
‘lastName’: ‘Smith’,
’email’: ‘[email protected]’,
‘phone’: ‘+13015551234’,
‘locationId’: location_id,
‘source’: ‘API’,
‘tags’: [‘potential client’, ‘contacted’]
}
response = requests.post(url, json=data, headers=headers)
if response.status_code == 201:
print(‘Contact created:’, response.json())
else:
print(‘Error:’, response.status_code, response.text)
Key Points
How to Send HighLevel API Requests With Zapier or Make
Zapier and Make let you connect HighLevel to other tools without writing traditional code.
Using Zapier
Using Make
Both platforms let you configure the request without writing code, but you’re still responsible for providing the correct endpoint, authentication headers, required fields, and JSON structure that HighLevel requires.
Common HighLevel API POST Errors and How to Fix Them
400 Bad Request
Your JSON is malformed, or a required field is missing. Check JSON syntax using an online JSON validator. Make sure all required fields exist (like locationId). See the error response details for which field is causing the issue.
401 Unauthorized
Your token is wrong or missing. Double-check that your Bearer token is correct in the Authorization header. Verify the token has not expired. Confirm your integration has the necessary scopes. If the issue persists, regenerate a new token in your HighLevel integration settings.
403 Forbidden
Your token lacks permission for this action. Verify your integration has the contacts.write scope for contact operations. Check the required scopes. Add the missing scope to your integration and regenerate your token.
404 Not Found
The endpoint URL is wrong or does not exist. Verify the full URL is correct. For creating contacts, use: https://services.leadconnectorhq.com/contacts/. Check for typos. Confirm you’re using the right API version.
429 Too Many Requests
You are sending requests too fast. HighLevel enforces rate limits on API requests. Currently, HighLevel documents a burst limit of 100 requests per 10 seconds and a daily limit of 200,000 requests (counted per Marketplace app and resource). Add delays between requests. Implement exponential backoff for retries. Check the rate-limit documentation for the limits that apply to your integration.
5xx Server Errors
A 5xx response generally indicates a server-side error with HighLevel’s systems. Check HighLevel’s status page for any reported incidents. Review the error response for details. Retry your request according to your error-handling strategy.
HighLevel API POST Request Best Practices
Protect API Tokens
Never commit to version control. Store in environment variables. Use secret management tools. Rotate tokens regularly. Revoke old tokens when they’re no longer needed.
Use Only Required Scopes
Grant only the permissions your integration needs. Follow the principle of least privilege. This limits damage if a token is compromised.
Validate JSON Before Sending
Use online JSON validators to check syntax. Test with sample data first. Log requests before sending. Check response status and body for issues.
Handle Errors and Rate Limits
Check status codes and error responses. Implement retry logic for transient failures. Add exponential backoff for retries. Log errors for debugging and monitoring.
Never Expose Credentials in Frontend
Do not hardcode tokens in JavaScript visible to browsers. Use a backend proxy for API requests. Keep all secrets on your server.
Frequently Asked Questions
Can I send a POST request to GoHighLevel without using an inbound webhook?
Yes. POST requests give you direct control over when and how data transfers. Use your API token for authentication.
How do I authenticate a POST request to the HighLevel API?
Use Bearer token authentication in the Authorization header. Create a private integration in settings to get your token. Include it in every request: Authorization: Bearer your_token.
How do I send a POST request to HighLevel using Postman?
Create a new POST request. Add your endpoint URL: https://services.leadconnectorhq.com/contacts/. Include your Bearer token in the Authorization header. Paste your JSON data (including locationId) in the Body tab. Click Send.
What is the difference between a HighLevel API request and an inbound webhook?
API requests mean you push data when you want. Webhooks mean HighLevel receives data from external applications via your webhook URL. Use API for full control, webhooks for real-time event handling.
Why is my HighLevel API POST request returning a 400, 401, or 403 error?
400 means invalid JSON or missing fields (like locationId). Check syntax and required fields against the Create Contact documentation. 401 means wrong or missing token. Verify your Bearer token and that it hasn’t expired. 403 means insufficient permissions. Verify your integration has the contacts.write scope and regenerate your token after updating scopes.
Where can I find my location ID?
Your location ID is available in your HighLevel account settings. It uniquely identifies your location or sub-account and is required for most API operations.
Conclusion
Sending POST requests to HighLevel gives you direct control over your integrations. You can automate data flow from any system to your account. With proper authentication, error handling, and security practices, this is reliable and scalable.
Start by testing in Postman or cURL. Then move to your production code. Follow security best practices with API tokens.
Keep your code examples and documentation in sync with the latest HighLevel API v3 documentation. Test your implementation in a staging environment before going live.
Need help setting this up? LeadsFlex can configure your HighLevel API integrations. Schedule a consultation.
