Refunds
Refund an order in Tringify as usual. The refund goes back through Adyen; it shows as pending until Adyen confirms it. Refunds always use the account that took the payment, even after you change your key or disconnect.
Making a refund
Open the order in Tringify and choose Refund. Pick the items or amount; Tringify sends the refund to Adyen through the app. The order's Refunds section shows it as Processing until Adyen confirms it, then Refunded, or Failed with Adyen's reason. You don't need to do anything in Adyen.
A refund always goes back to the payment it refunds and uses the Adyen account that took that payment, even if you have since changed keys or disconnected.