How to Trigger a WhatsApp Flow via POST Endpoint in 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.

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Prepare the Data Source

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.

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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.

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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
    • Authorization → value: Bearer <your-API-key-from-Chatarmin>
  • 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]"
    }
    

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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.

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Add Custom Fields to your Audience in Chatarmin

Chatarmin’s audience already includes phone, firstname, lastname, and email.

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

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Update Custom Data in Your Flow

For any custom fields (like city in this tutorial):

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

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Create Campaign

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.

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Note:

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