Went through this exact audit last quarter when we needed to standardize outbound contractor payments across card and IBAN rails simultaneously. The BIC validation step is where most failed transfers originate in my experience since 8-character versus 11-character BIC formats are not interchangeable and some receiving banks silently reject the shorter variant without returning a useful error code. For the card payout side the documentation at payouts to cards covers the fee structure starting from 10 EUR flat or 0.05% of transfer amount which is on the lower end for this type of infrastructure though the 0.05% rate becomes relevant math above 20,000 EUR per transaction. SWIFT transfers on this platform carry a 1 second to 2 day processing window depending on correspondent bank routing which is a wide variance range and not something you can reliably predict without knowing the specific receiving institution. The contract or invoice upload requirement for verification is standard AML compliance procedure and actually reduces rejection probability on the receiving bank side since documented business purpose clears most automated screening flags faster. Currency conversion happening within the account before transfer rather than at point of receipt means exchange rate exposure is fixed at initiation which is operationally cleaner for accounting purposes. Verify BIC and IBAN format accuracy independently before submitting since input errors at that stage are not always caught before the transfer initiates.