You choose how much you want us to donate.
For 1% off purchase price, use WCF1; for 10% off, use WCF10; for 25% off, use WCF25; and for 50% off, use WCF50.
Here is an example:
If your purchase totals $100, and you apply WCF1, your price is $99, and we contribute $99 to WCF.
If you use WCF10 coupon, you pay $90 which we turn around and give $90 to WCF. Simple?