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.