(10)Technical interoperability is a prerequisite for competition. In order to create an integrated market for electronic payments systems in euro, it is essential that the processing of credit transfers and direct debits is not hindered by business rules or technical obstacles such as compulsory adherence to more than one system for settling cross-border payments. Credit transfers and direct debits should be carried out under a scheme, the basic rules of which are adhered to by PSPs representing a majority of PSPs within a majority of the Member States and constituting a majority of PSPs within the Union, and which are the same both for cross-border and for purely national credit transfer and direct debit transactions. Where there is more than one payment system for the processing of such payments, those payment systems should be interoperable through the use of Union-wide and international standards so that all PSUs and all PSPs can enjoy the benefits of seamless retail euro payments across the Union.