PayPal has now decommissioned the pilot-payflowpro.paypal.com as a testing URL. Everything now must be verified against tlstest.paypal.com instead. Accounts that have not “verified” against this URL will continue to get messages from PayPal.
If you are already a PayflowPayements.com & MARTEC360 customer/subscriber of the service, please contact your account manager first before performing these verifications yourself. We had to republish a new test URI today (June 26th, 2018) now that the pilot url from PayPal was retired.