Chargent supports multiple active gateways. If only one gateway is active, it will be used for each payment transaction. With multiple gateways, you need to either provide the gateway you want to use for that transaction in the Gateway field or you can create a lookup to each gateway and create a flow that allows that field to populate prior to pressing the Charge button.
If you are using the Payment Console (Platform and Enterprise Edition), you will be prompted to enter the Gateway field prior to entering the payment information.
Many customers use Chargent's multiple gateway functionality to keep payments for different business entities separate while using a single Salesforce account, or for supporting multiple geographies / currencies that might require multiple payment gateways.
If you do have multiple gateways active and do not have the Gateway field populated you will see the following error message.
Click Here to see all Chargent Gateways