Payment Method Identifiers

2016-05-04: Being worked on by payments task force.
2016-08-24: APA comment filed requesting a11y impact statement.
2017-01-04: Explicit review request received.
2017-03-06: Response to review request asking about disposition of previously filed comments.
2017-09-14: Published as CR, although APA comments still open.
2019-01-09: Calling the action on Payment Request API sufficient for this one as well.