# How to Set Up a PDF (Document) Header Correctly

### What is a PDF (Document) Header?

A PDF header lets you send a document (invoice, receipt, report, etc.) **at the top of a message**.

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#### Steps: 

When creating a WhatsApp template and choosing the **Header** as **Media** type, follow the steps below to successfully pass the correct PDF during the API call:

1. From the **Header** drop-down, select **Media**, then choose **Document** as the media type.
2. Set the **Type** to **Dynamic**. Only **Dynamic** headers can accept documents sent via the Mercuri API.

<figure><img src="/files/3FTe9Od3ndZFlRfdxDYD" alt="" width="563"><figcaption></figcaption></figure>

3. In the **Value** field, enter a variable name (for example: `document`).&#x20;
4. In the **Sample Value** field, upload a sample `.pdf`, `.doc`, or `.docx` file. This file is used **only for preview and template approval** and will **not** be sent to users.
5. Complete and submit the WhatsApp template for approval.&#x20;
6. **Once the template is approved**, update your **Mercuri API payload** by adding the required details, such as the **template ID** . Make sure the **same variable name** used in the template is passed again in the API parameters.

> {
> \
> "**parameters**": {
> \
> "**document**": "<https://your-storage.com/invoice\\_123.pdf>"
> \
> }
> \
> }

7. When sending the message using the Mercuri API, pass the **PDF as a publicly accessible URL**, not as an auto-download link.

***

Following the steps above ensures that the **correct PDF** is picked up from the Mercuri API and displayed properly in the message header.&#x20;

This allows you to send the intended document smoothly and consistently to your users.


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