Security ISIN, bank BIC, SEPA RF reference or European EPC QR text — spaced or plain. Check format and digits with a no-key demo quota. Does not send money or query registries.
A matching check digit or format is arithmetic consistency. It does not prove the security is listed, the BIC is in the SWIFT directory, or that a payment was made.
Pick ISIN, BIC, RF or EPC QR, keep the sample or paste your own, then Validate / build.