chatarmin

With Chatarmin’s custom POST Endpoint, you can trigger a WhatsApp flow from external tools like Make.com, webhooks, Google Sheets, Slack, Airtable or any other system that supports sending HTTP POST requests. This article explains, step-by-step, how to send data from Make.com to start a flow in Chatarmin and pass custom data into your WhatsApp automation.

First, decide which external tool or app will send the data (such as a Make.com webhook, a Google Sheets module, or an HTTP trigger). Send a test entry from your data source, so Make.com can detect the structure of your data.

Create a New Flow with a Custom POST Endpoint in Chatarmin

In your Chatarmin dashboard, create a new flow and select Custom POST Endpoint as the trigger. Keep this screen open so you can copy the endpoint URL and header values in the next step.

Configure Make.com to Send Data to Chatarmin

In Make.com, add a new HTTP module and set it to "Make a request."

- URL: Paste the custom endpoint URL you copied from Chatarmin.
- Method: POST
- Headers: Copy the Headers you see in chatarmin
 - <code>Authorization</code> → value: <code>Bearer &lt;your-API-key-from-Chatarmin&gt;</code>
- Body type: Raw → JSON (application/json)
- Request Content: Use the JSON format and input your variables from the data source
 For example:
 { "phone": "[put phone variable here]", "city": "[put city variable here]" }

- In Make.com, add a new HTTP module and set it to "Make a request."
 - URL: Paste the custom endpoint URL you copied from Chatarmin.
 - Method: POST
 - Headers: Copy the Headers you see in chatarmin
 - <code>Authorization</code> → value: <code>Bearer &lt;your-API-key-from-Chatarmin&gt;</code>
 - Body type: Raw → JSON (application/json)
 - Request Content: Use the JSON format and input your variables from the data source
 For example:
 { "phone": "[put phone variable here]", "city": "[put city variable here]" }

In Chatarmin, paste the request content into the Payload Body field

Copy the JSON body from make.com and paste it in the "Payload Body field". Now you can click the "save" button.

Add Custom Fields to your Audience in Chatarmin

Chatarmin’s audience already includes <code>phone</code>, <code>firstname</code>, <code>lastname</code>, and <code>email</code>.

For these standard fields, you don’t need to add anything.

For new data fields (e.g. <code>city</code>), go to Audience → Add Column and create a field named exactly as the incoming key (<code>city</code>).

- For these standard fields, you don’t need to add anything.
- For new data fields (e.g. <code>city</code>), go to Audience → Add Column and create a field named exactly as the incoming key (<code>city</code>).

For any custom fields (like <code>city</code> in this tutorial):

Add an Update Customer action in your flow.

Select the property you created (e.g. <code>city</code>) and map in the value coming from the API/POST data.

- Add an Update Customer action in your flow.
- Select the property you created (e.g. <code>city</code>) and map in the value coming from the API/POST data.

You can now use variables from your incoming data. Remember: You must use a campaign template and not a message to initiate conversations using this trigger. It will not work using messages. Make sure that you create a template for a campaign first with the variables you sent via the POST webhook.

Make sure that the phone number is always sent in international format, including the country code, with no spaces or special characters. For example: +436781211536