v2.0: Fix for Adyen (embedded) to allow disabling this payment method.
v2.0: NEW PAYMENT METHOD: Klarna
v2.0: Email receipt fix to prevent Outlook from doing what Outlook does (ie. rendering things in its own uniquely horrendous way).
v2.0: Fix for Stripe Connect subscription receipts not showing subscription links.
v2.0: Braintree fix for 3D Secure v2 to prevent errors in some circumstances.