* fix String converison * add method * rename to USD * fix types * fix parsing of forms * fix tests * fix header * use larger type * use int64 * rename func * move currency to separate package * convert types, renames * fix usercredits * remove unnecessary conversion * fix comment and named params
* move offer out of marketing package and remove marketing package * fix imports * fix rename errors * remove offer service * change package name from offers to rewards * fix linting * remove unused code and use appropriate comment