Please see the ProtectPay API Appendix for the current list of supported list of external gateways, and the required data elements for connecting to them from ProPay's system.
For example, you may have an API user name and API transaction key that must be provided to ProPay in order for our teams to create a Merchant Profile for a specific gateway, which enables processing with that provider.
https://www.propay.com/en-US/Documents/API-Docs/ProtectPay-API-Manual-Appendix
It includes:
LegacyProPay (US and some International Merchants)
LegacyProPayCanada (Canadian merchants)
Authorize.Net AIM
Braspag
ChinaTrust (CTBC)
CyberSource
Digital River
EasyPay Korea (KICC)
Echo
Merchant E Solutions
Meritus
MTrex
Network Merchants (NMI)
Orbital/Paymentech (Salem and Tampa Platforms)
Pagos Online
PayflowPro
PaymentXP
PayPoint (FirstData)
PayVision
PlanetPayments (internal Multi-Currency processing)
SecurePay
VeriTrans
WebCollect
WorldPay