(24)In order to define the relevant interchange fee caps for domestic debit card transactions, it is appropriate to allow national competent authorities entitled to ensure compliance with this Regulation to collect information regarding the volume and value of all debit card transactions within a payment card scheme or of the debit card transactions pertaining to one or more payment service providers. As a consequence, payment card schemes and payment service providers should be obliged to provide relevant data to national competent authorities as specified by those authorities and in accordance with the time limits set by them. Reporting obligations should extend to payment service providers such as issuers or acquirers and not only to payment card schemes, in order to ensure that any relevant information is made available to the competent authorities which should, in any case, be able to require that such information is collected through the payment card scheme. Moreover, it is important that Member States ensure an adequate level of disclosure of the relevant information concerning the applicable interchange fee caps. In light of the fact that payment card schemes are generally not payment service providers subject to prudential supervision, competent authorities may require that the information sent by these entities is certified by an independent auditor.