(15)While the use of anonymous prepaid cards issued in the Union is essentially limited to the Union territory only, that is not always the case with similar cards issued in third countries. It is therefore important to ensure that anonymous prepaid cards issued outside the Union can be used in the Union only where they can be considered to comply with requirements equivalent to those set out in Union law. That rule should be enacted in full compliance with Union obligations in respect of international trade, especially the provisions of the General Agreement on Trade in Services.