API: Adding a `type` to transaction resources, for easier identification (updateinfo, subscription_modification, subscription_renewal or subscription_cancellation).
API: Customer portal resource improvement to `allowfrequencymodification`
API: Adding `cancellation_source` to subscription resources (mit_api, mit_admin, mit_dunning, mit_checkout, cit_checkout).
v2.0: Fix PayPal Checkout selected by default, and shown for $0 orders on checkout load.
v2.0: Increase shipping rate description maximum character count to 200.
v2.0: Various accessibility improvements to the cart and checkout.
v2.0: Improvements to currency conversion in shipping rates.