With Sign in with Roblox (OAuth 2.0, scopes openid and profile), or by verifying a phrase on your Roblox profile, we store your Roblox user ID, username, display name and avatar. We don’t get your Roblox password or account access.
To check payments, we use Roblox’s public data and a Cortexed service account to see whether your Roblox account owns the item you were asked to buy, and (when the studio allows it) the studio group’s sales record. For studios, we read the group’s audit log to detect payouts to designers.