I would like to set up a fake donate page using a PayPal donate button that goes to a sandbox account. Is this possible?
You need to register this page: https://developer.paypal.com/
Then you can use the paypal API like this:
<html>
<head>
<title>Test Page</title>
</head>
<body>
<p>This is a test HTML file.</p>
<form action="https://www.paypal.com/cgi-bin/webscr" method="post">
<input type="hidden" name="cmd" value="_s-xclick">
<input type="hidden" name="encrypted" value="-----BEGIN PKCS7-----...[Encrypted message]...-----END PKCS7-----">
<input type="image" src="https://www.paypalobjects.com/en_US/i/btn/btn_donateCC_LG.gif" border="0" name="submit" alt="PayPal - The safer, easier way to pay online!">
<img alt="" border="0" src="https://www.paypalobjects.com/en_US/i/scr/pixel.gif" width="1" height="1">
</form>
</body>
</html>