Product info shouldnt be credential2
Refactor checkum, PayuPaisa was reversing udf fields
Slip down user_defined method
PayU status should be based off status from param, checksum should be handled by acknowledge
to_s discount as it can be nil on returns
Fix PayuInPaisa module tests
Remove super arguments
Sanitize field values before generating the form fields
Move payu in test credentials to fixtures
Move ordered checksum fields into a constant in the PayU helper
Merge pull request #920 from Shopify/payu_checksum

Payu(Paisa) refactor