Merge pull request #60 from davidbgk/938658-refactor-helpers

Refactor data setup withSeller/Product (bug 938658)
Adding postback after payment redirection (bug 936132, 936134)
Adding dependencies (bug 936132, 936134)
Merge pull request #61 from davidbgk/936132-postback2

Adding postback after payment redirection (bug 936132, 936134)