Definitely a scam, they are not listed on the The Mastercard Compliant Service Provider List of which anyone can view and download directly from Mastercard https://www.mastercard.us/en-us/merchants/safety-security/security-recommendations/service-providers-need-to-know.html
If Payoneer is legit why isn't it on the list like Paypal and alllll the other legit companies? It is because they are NOT legit and they are a scam!
