Ask HN: Best practices for communicating bank account changes to customers?

How can I communicate bank account changes to customers in a way that: a) Allows them to know that the current change is legitimate b) Helps them know how to verify future changes, to reduce the chance of any future wire fraud I have customers, previously I used one bank, now I'm switching to a different bank, so that means next time I invoice them they'll see a new bank account. I want them to know that it's legit, but I also want to make sure that they can't be tricked by anyone pretending to be my company now or in the future.