In Phortune, write relationships between payment accounts and merchants they interact with
Depends on D20713. Ref T13366. When a payment account establishes a relationship with a merchant by creating a cart or subscription, create an edge to give the merchant access to view the payment account.
Also, migrate all existing subscriptions and carts to write these edges.
This aims at straightening out Phortune permissions, which are currently a bit wonky on a couple of dimensions. See T13366 for detailed discussion.
- Created and edited carts/subscriptions, saw edges write.
- Ran migrations, saw edges write.
Maniphest Tasks: T13366
Differential Revision: https://secure.phabricator.com/D20715