* Stripe SCA
- Upgrade to latest Stripe API
- Deprecate Stripe Checkout for CC
- Migrate CC payments to Payment Intents
* Move SCA to its own view
* Handle CardErrors for PaymentIntents
* Abilty to handle charge webhooks with PaymentIntents
* Better handling of Stripe References
* Fix Stripe Tests
* Move SCA page into orderlayout; perform iFrame SCA
* Handle disputes and pi-webhooks better, fill more into ReferencedStripeObject
* Optionally pass prefetched PaymentIntent to handle-func
* Fix style
* Send message to window.parent not window.top (widget compatibility)
* More accurate loading message
* Show a cog on sca_return.html. On a good internet connection, you barely see it, but on a bad one…
* Robust error handling
* If it's a method and used like a method, let's actually call it like a method!
* Remove logging statement
* Fix JavaScript interference with other frame events
* Use 4:3 aspect ratio, but at least 600px
* Adjust to django_scopes
