Mimic CheckoutControlller complete
Mimic CheckoutControlller complete

order_just_completed? is not correct without this flash message

freerunningtech/solidus-adyen,freerunningtech/solidus-adyen,StemboltHQ/solidus-adyen,freerunningtech/solidus-adyen,freerunningtech/solidus-adyen,StemboltHQ/solidus-adyen,StemboltHQ/solidus-adyen,StemboltHQ/solidus-adyen