* Designed payment account modal, which allows user to:
* View payment methods (fixesmozilla/payments-ui#163)
* Add new payment method (fixesmozilla/payments-ui#165)
* Delete payment methods (fixesmozilla/payments-ui#164)
* Designed change subscription page to use the same modal interface as
above (fixesmozilla/payments-ui#168)
* Designed page to view transaction receipts and history (fixes
mozilla/payments-ui#167)
* When clicking a transaction, a receipt pops up in a modal
* Eliminate manual payment account replacement when an account is
deleted
* Removed the end bit that requires FxA
* Consequently, removed the bit that asks for password at the end of
the process
* Changed all occurrence of “Add” to “Add new credit card” to clarify
the intent of the link
* Updated UX design document to describe the behaviour of the “Replace
All Subscriptions” feature
sans account. Purchase now requires Firefox Account.
* Buy wireframe: same as above
* Buy error: add label style for generic errors – ones that aren’t
specific to a form field
* Management wireframe: Add ability to replace payment method for all
subscriptions at once
* Added management flow and wireframe (fixes#23)
* Updated buy wireframe (fixes#24)
* Added list of errors and form field behaviour to handle them (fixes
#45)
* Added form field labelling for accessibility (fixes#50)