How to Set Up an Image Header Correctly

What is an Image Header?

An image header allows you to display an image (banner, product visual, promotion creative, etc.) at the top of a WhatsApp message.

This is commonly used for branding, promotions, announcements, and visual context before the message body.

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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 image during the API call:

1. From the Header drop-down, select Media, then choose Image as the media type.

2. Set the Type to Dynamic. Only Dynamic headers can accept images sent via the Mercuri API.

3. In the Value field, enter a variable name (for example: image).

4. In the Sample Value field, upload a sample image (.jpg or .png). This image is used only for preview and template approval and will not be sent to users.

5. Complete and submit the WhatsApp template for approval.

6. Once the template is approved, update your Mercuri API payload by adding the required details, such as the template ID. Ensure the same variable name used in the template is passed again in the API parameters.

{ "parameters": { "image": "https://your-storage.com/promo_banner.png" } }

1. When sending the message using the Mercuri API, pass the image as a publicly accessible URL, not as a private or auto-download link.

Following the steps above ensures that the correct image is picked up from the Mercuri API and rendered properly in the message header.