The link to the buyer's protection section is here https://www.paypal.com/us/cgi-bin/webscr?cmd=xpt/Marketing/securitycenter/buy/Protection.
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Please be more specific about what you are trying to do this with. Like Buy now button Gift send to name & address. It doesn't have to be that fancy, but I'm sure you get the point.
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In the Buy Now Button Setup Flow Step 3 Fifth option:Take customer to a specific page (URL) after successful checkout. Additionally the fourth option lets you specify where to send them if they cancel the checkout process.
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