1. Where a payment transaction is initiated by or
through the payee in the context of a card-based payment transaction
and the exact amount is not known at the moment when the payer gives
consent to execute the payment transaction, the payer’s payment service
provider may block funds on the payer’s payment account only if the
payer has given consent to the exact amount of the funds to be blocked.
2. The payer’s payment service provider shall
release the funds blocked on the payer’s payment account under paragraph
1 without undue delay after receipt of the information about the exact
amount of the payment transaction and at the latest immediately after
receipt of the payment order.