Use the Configuration Payment settings to configure your credit card processor information:

Save your gateway settings and other acceptances on this screen. 

Credit Card: This is only necessary if you are using a stand alone terminal (set to Prevent Verification) or a Gateway (select the Gateway from the drop down). If using an EMV device you set up the IP address under Hardware>MSR - select Pax or Ingenico for communicating to the EMV Reader

Gift: Integration is with Smart Transactions (STS), enter Merchant and Terminal ID's provided by STS

Paypal/Dwolla: Option to accept as payment is enabled here