EBU Single Rulebook Q&A 11 April 2023 2023_6777 Exchange rate mark-ups part of 'all charges payable'/'currency conversion charges'

Is an exchange rate mark-up (the difference between the interbank rate and the exchange rate offered by the PSP to its PSUs) to be considered as part of ‘all charges payable’ as per PSD2 and the ‘currency conversion charges’ as per CBPR2 prior to the initiation of the payment? How should PSPs disclose this in the payment flow?