I'm creating a mobile app that I'd like to have the ability to receive donations to my Amazon account. Say, like $5 to my account to spend. Is this possible, and if so, could someone direct me to the information?
Amazon accounts can receive Donations but there are a few caveats. (Taken from this article)
Who can use Amazon Simple Pay Donations?
Amazon Simple Pay Donations can be used by U.S.-based, IRS-certified 501(c)3 Non-Profit Organizations to collect donations. Follow a few quick and easy instructions to set up your Amazon Payments Business account with Business type set to "Non Profit, Political and Religion."
It is probably easier to use PayPal to collect donations
There's no donations for individuals, but what most people (I've seen Marco Arment and Lifehacker do this) is join the Affiliate Program and ask people to buy something with the affiliate link.
The next Amazon choice would be to ask them to send a gift card to your email, but this reeks of amateurism and ticks people off.
Flattr's micropayment model has been going up pretty well lately. You may want to look into that as an option.