use cards that is affiliated with openbucks. I.E. Subway, CVS, Dollar General
though i can't speak on DG, but bought 15$ subway & 15$ CVS, got 1:1 assuming since they use openbucks it should be 1:1
though i can't speak on DG, but bought 15$ subway & 15$ CVS, got 1:1 assuming since they use openbucks it should be 1:1