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My form needs to consist of a webpage that processes these donations.
To clear the confusion, it's the other way around - You embed your form to your website (and not vice versa). Once you have your form ready, there are different methods of embedding it to any website.
Complete guide: Which-form-embed-code-should-I-use
To aid you in figuring out what to use, refer to the guide above. As a tip, I recommend you finalize and finish your website first then try using the iframe embed method as it works very well on most occasions.
Related guide: Getting-the-form-iFrame-code