${?}_{{?}_{{?}_{?}}{?}_{{?}_{?}}\text{c}\text{o}\text{n}\text{t}\text{a}\text{i}\text{n}\text{a}\text{c}\text{h}\text{i}\text{p}\text{t}\text{h}\text{a}\text{t}\text{c}\text{a}\text{n}\text{s}\text{t}\text{o}\text{r}\text{e}\text{i}\text{n}\text{f}\text{o}\text{r}\text{m}\text{a}\text{t}\text{i}\text{o}\text{n}\text{a}\text{n}\text{d}\text{c}\text{a}\text{n}be\text{u}\text{s}\text{e}\text{d}\text{f}\text{o}\text{r}\text{s}\text{e}\text{v}\text{e}\text{r}\text{a}\text{l}\text{p}\text{u}\text{r}\text{p}\text{o}\text{s}\text{e}\text{s}\text{.}}$

Electronic checks

Stored$-$value money cards

Purchasing cards

Smart cards

Person$-to-$person payments