today i had a person who wanted to buy my service attempt to pay me via paypal. he says paypal refused the transaction giving him this message PayPal is constantly working to protect our members against fraud. We review every transaction before it is approved, and we may block a payment when we detect a potential risk. This payment can only be funded with eCheck. now i logged into my paypal its all clear no issues. even changed my email for safety sake why would a person get the above message ?