Article 30(3) requires ASPSPs to ensure that their interfaces follow recognized communication standards issued by international or European standardisation organisations. Recital 21 emphasizes that, to achieve interoperability, the interface should use standards developed by such bodies, be adequately documented, and made publicly available.

ISO 20022 is an example of a widely used European standard to harmonize payment-related messages, including execution status codes. Applying these standards consistently ensures predictability, transparency, and interoperability, enabling third-party providers to process payment information and understand execution status reliably.

In practice, some ASPSPs provide guidance or documentation based on internal approaches, which may not fully align with recognized standards. This can create differences in message interpretation and affect interoperability.

We seek confirmation that, once an ASPSP has chosen to implement a recognized communication standard, the standard should prevail in its entirety and consistently, regardless of internal technical documentation or later clarifications issued by the ASPSP.