just like reward points. just instead of reward points, that would be for initial purchase. rest the functioning will remain the same.
For the start maybe, once it works fine they can eventually accept other crypto as payment, but for a start since it's a new adoption they need to examine or to consider those who are not still aware in crypto. It's a good start even it only focuses on being a stablecoin, let's just hope they will consider more function in the future.