Many popular payment processors, such as TSYS and First Data, connect through some of these gateways, so you would just need to ask them to set you up with a payment gateway account from one of the gateways that Chargent is already integrated with.
If your payment company is not on our list, they may still be connected to some of the payment gateways that Chargent is integrated with.
Many payment companies have their own payment gateways, and that is all they list on their web site, but if you ask them if they will accept transactions through payment gateways other than their own, often the answer is yes.
They may even resell and be able to set you up with a payment gateway account Chargent can connect to.
Ultimately many payment companies just want the transactions, so they will accept transactions through payment gateways other than their own, such as Authorize.net, Cybersource, USAePay, or Paytrace.