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If you're working on a form and would like to add images to your payment tool, uploading your image from a third party source. One of the common favorites is creating a Dropbox account and uploading your images there.
Once the images are uploaded, get the link to the image and proceed with your payment wizard. You will notice in the adding/editing of products there is a textbox for Image URL. You will place the link to the image in that field and then just save the products that you would like to have in your form.
Once complete the image should appear in your form.
Here is a sample animation provided by my colleague on how it should work:
If you have questions, please do let us know.