> ## Documentation Index
> Fetch the complete documentation index at: https://help.chatarmin.com/llms.txt
> Use this file to discover all available pages before exploring further.

# How to Trigger a WhatsApp Flow via POST Endpoint in Chatarmin

> Chatarmin guide: 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.

<iframe src="https://www.loom.com/embed/89b7967119aa4083b5494edce459abc1" title="Loom video" width="100%" height="420" allowFullScreen />

#### 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.

#### 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.

<img src="https://mintcdn.com/chatarmin-help-center/FkIbrM1lxMp-fNLL/images/30747961-3fba-4780-bec4-68f3193b304d/019b9c80-8a94-7776-81ea-08fda1e548d1.png?fit=max&auto=format&n=FkIbrM1lxMp-fNLL&q=85&s=e8ab7ce07fb023bbd27562733953be7b" alt="Chatarmin help center image" width="806" height="356" data-path="images/30747961-3fba-4780-bec4-68f3193b304d/019b9c80-8a94-7776-81ea-08fda1e548d1.png" />

#### 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:

    ```
    &#123;
    "phone": "[put phone variable here]",
    "city": "[put city variable here]"
    &#125;
    ```

#### 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.

<img src="https://mintcdn.com/chatarmin-help-center/FkIbrM1lxMp-fNLL/images/30747961-3fba-4780-bec4-68f3193b304d/019b9c80-8a8a-7244-8693-bda5a7b50e83.png?fit=max&auto=format&n=FkIbrM1lxMp-fNLL&q=85&s=fe455cb560086bcff4332961c4669170" alt="Chatarmin help center image" width="784" height="488" data-path="images/30747961-3fba-4780-bec4-68f3193b304d/019b9c80-8a8a-7244-8693-bda5a7b50e83.png" />

#### 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`).

#### 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.

#### 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.

#### 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