From my own personal experience, the required <form runat=server> tag for the asp.net pages conflicts with the <form> tag in the simple checkout button. A workaround is to use a simple HTML file or don't include .net form controls that require an asp.net form tag in your .aspx file.
What if you don't want to use the donation button? I am using the button to do a "Pay your bill online" button that is simple text. The customer can then enter the amount of their bill. I am not a .net guy. I know a lot about HTML just have never worked in .net. I didn't expect to run into this problem. We can copy and paste but the CMS will not allow us to publish.
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