If you choose gift card, it’ll be sent to your primary email address. If you opt for direct deposit, a space will appear on the page below to enter your bank details. And if you want a check sent to your contact address, keep in mind that the minimum payout is greater than it is for gift cards or direct deposit ($100 vs. $10), and a processing fee applies.
I once persuaded my mum to buy all my Christmas presents using my affiliate links on Amazon, and then found out that Amazon won’t pay out to anyone with the same surname as you (as they assume them to be family; luckily I have an unusual surname!) or anyone who lives at the same address. However one of my friends has ordered through one of my affiliate links and the commission has tracked for that. It’s my ONLY commission, mind. And my account hasn’t been shut down yet (touch wood, fingers crossed etc etc…)