This is an important warning due to an exponential increase of the cyber fraud called "change of bank details". If someone contact you by e-mail claiming being a person you are in business with and asking to change bank coordinates for an upstanding payment, be aware it may be a fake message (or even fake authorisation letter) and you should verify the request by phone directly with the counterpart.
This fraud method has spread exponentially in Europe in the last 4 weeks, affecting and damaging a substantial number of SME and even large companies. Some banks in the EU allow the fraudster gangs to set up IBAN payment channels with account holder in name of the victim companies without any controls.
It is wise to warn also your business partners and clients.