charity receipt code

You give to a charity (say helping out with the typhoon recovery) and in the receipt of payment you get a unique randomized code (similar in uniqueness to a software license key). This code is stored in a secure database keyed to the charity event (say the typhoon), the charity, and the donation amount but stripped of any identifying information.

Then these codes can be used at businesses who want to reward donations. For example, if you donated $25 to help with the typhoon you could get a coupon for a free coffee at your local coffee shop. All you'd need to do is go to that shop's website and type in your unique charity receipt code which would net you a coupon. The nice thing about these codes is one could get rewards from multiple businesses for a single donation. The idea is to let any business reward charitable giving, not tie the reward to a single transaction where the charity needs to set up the reward infrastructure on its own.