Summary: Ref T2787. Allow merchants to flag orders for review. For now, all orders are flagged for review. Eventually, I could imagine Herald rules for coarse things (e.g., require review of all orders over $1,000, or require review of all orders by users not on a whitelist) and maybe examining fraud data for the providers which support it.
Test Plan: {F215848}
Reviewers: btrahan
Reviewed By: btrahan
Subscribers: epriestley
Maniphest Tasks: T2787
Differential Revision: https://secure.phabricator.com/D10675
