Wallet discounts
Summary:
This is an incomplete implementation in that neither;
- does the UI reflect an opportunity to set a discount to a wallet (or all wallets owned by the user), nor
- does the UI apply that discount to the listed prices, nor
- is it tested as part of CI (only manually verified).
Test Plan: None yet
Reviewers: #hkccp_developers, vanmeeuwen
Reviewed By: #hkccp_developers, vanmeeuwen
Subscribers: machniak, #hkccp_developers
Differential Revision: https://git.kolab.org/D1063