Shopify/active_merchant — pull request #1160 by odorcicd (2014-05-02 16:30:38+00:00)
Title: Pxpay credential based url

@bslobodin @bizla /cc @silverstreaked

This switches Pxpay over to credential based url, because we need to redirect the user to the `URI` specified in the API response. This means mappings can't really be used (and we don't send the customer email because of this, but its optional).