Authorize.net and donations question

Hi I'm trying to see if the Authorize.net integration can function in a way where I have both established/suggested choices for a donation (similar to how the products appear in a list form) as well as have donors input an other amount. Is this possible specifically using authorize.net?

Thank you for reaching support,

You may set your fixed donations as one of the items on your Product list:

Then implement Multiple Payment methods on the form for the donation part: https://www.jotform.com/help/182-how-to-create-a-basic-multiple-payment-form/

Let us know if you have any further questions.

Best.