1.2.1.2 - Paywall checkout

Minor changes to rendering of a Paywall with "checkout" capabilities, the Paywall was not rendered due to issue where the "tcid" parameter was missing in generation of signature.

This fix will render the Paywall but the ticket authentication process is scheduled to be added in a future release, which means that autologin is not currently not supported in this version for Paywall with "checkout" option.