Adding a donate button and limiting qty to 1

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I need to add a dontate section to the shopify cart, how do I do this? I tried the app Share the love but as I am not selling my item (its a free physical item) it didn't seem to let me choose any amount to dontate when I tested it. Any other ideas?


Also Quantities. I want the user to only be able to order 1 qty of an item in a transaction how do I sort that? This seems like obvious functionality for a selling site but yet its difficult.


Failing all of this how do I embed a paypal donate button into the cart ordered page?


Thanks for any help everyone!