I just tried to use by CA card with fairfx’s transfer service, but their website doesn’t recognise the CA card number as being a mastercard debit, saying the number is invalid for the card type.
After a call to FairFx apparently the BIN isn’t defined in their database… after taking the first 6 digits he said they would contact me when it’s fixed… probably ‘a few days’…
(so I paid using a legacy card, sorry Monzo — now, if I could have sent an IBAN transaction from the Monzo app…)