The LinkURL parameter specifies a URL link to be associated with a stamp. You need to include the LinkURL parameter in the stamp file for text stamps.  Example below:

LinkURL   (https://appligent.com/docs.appligent.com)

Note: If you wish to apply a LinkURL to a JPEG or TIFF image, you must create two stamp items in your stamp file. The first stamp item must be the image and the second stamp item must be the LinkURL you wish to stamp on the image.