These have colloquially been referred to as blind credits, and are seriously frowned upon by the card networks. We told a Visa exec that we were planning on doi

These have colloquially been referred to as blind credits, and are seriously frowned upon by the card networks. We told a Visa exec that we were planning on doing these and he said that at any substantial volume, we'd get shut down. Square has a totally different cachet than GiftRocket does, so they may actually be in a position to bend the rules. Seemingly, other smaller payments providers have been able to implement APIs around this.