(13)It is important to take measures to strengthen the confidence of PSUs in the use of such services, especially for direct debits. Such measures should allow payers to instruct their PSPs to limit direct debit collection to a certain amount or a certain periodicity and to establish specific positive or negative lists of payees. Within the framework of the establishment of Union-wide direct debit schemes, it is appropriate that consumers are able to benefit from such checks. Nevertheless for the practical implementation of such checks on payees, it is important that PSPs are able to check on the basis of IBAN, and, for a transitional period, but only where necessary, BIC, or some other unique creditor identifier of specified payees. Other relevant rights of users are already established in Directive 2007/64/EC and should be fully ensured.