In the WA_Globals.php file, the following settings controll the payment gateway:
/* Payment Settings
* Use this key to determine the appropriate value for the $WAGLOBAL_Gateway setting:
* PayPal = 1
* Authorize.net = 2
$WAGLOBAL_Gateway = 1; //Enter the appropriate value based on the above key. PayPal is specified by default.
$WAGLOBAL_Test_Mode = false; //Set to true if you are testing your shopping cart and do not want to send information to your payment gateway.
//Only complete the payment gateway options for the gateway you have selected to use in the $WAGLOBAL_Gateway setting.
$WAGLOBAL_Paypal_Sandbox = "false"; //Set to true if you wish to use the PayPal Sandbox for testing transactions.
$WAGLOBAL_Paypal_User = "";
$WAGLOBAL_Paypal_Password = "";
$WAGLOBAL_Paypal_Signature = "";
$WAGLOBAL_Authnet_Sandbox = "TRUE"; //Set to true if you wish to use the Authorize.net Sandbox for testing transactions.
$WAGLOBAL_Authnet_login = "";
$WAGLOBAL_Authnet_tran_key = "";
for authorize.net, set the $WAGLOBAL_Gateway to 2:
$WAGLOBAL_Gateway = 2
and set the $WAGLOBAL_Authnet_login $WAGLOBAL_Authnet_tran_key for your Authorize.net account.