Zoho Creator API and Signature Field

Zoho Creator API and Signature Field

I have a form in a Zoho Creator app that has a Signature field in it, where the user can sign their name with the mouse or finger on the screen. The image gets stored in creator as a PNG file. I would like to have a VB .NET application be able to automatically download those PNG files locally to our onsite file storage. I can make an API call to get the correct https path to the signature files, but to "browse" to those files requires authentication with Creator.

Is there any way to pass parameters for Creator login or credentials, or authtoken, in the url path to the image? Here is an example of a URL for a PNG signature file:

    Access your files securely from anywhere

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