Scam alert: Beware of spoofing. We have received reports of individuals impersonating the Credit Union – a tactic known as spoofing. NextMark will NEVER call and ask you to provide sensitive information such as your full debit card number, PIN, or prompt you to retrieve a one-time passcode. If you receive a call from us and you feel unsure, hang up and call NextMark directly at 703-218-9900.