This lets you switch the operation of the payment system as follows:

• ON – the payment system is active and is available for customers to select for payment
• OFF – the payment system is disabled
• TEST – the payment system is set in test mode; it will only be visible at checkout if you are logged in as a store admin. Orders will be passed with a 'test' flag so cards will not be billed.
• FAKE – an additional test setting; this simulates an order callback without sending anything to the payment gateway. It is a useful way to test the settings and see what happens with successful orders but without having to repeatedly go through the payment stage on the remote site.

Most payment systems have a process currency. If you leave this blank, Kartris will pass orders to the payment system in whatever currency the user selects on your site. For that to work, your payment system provider must support multiple currencies, and your account with them must permit orders in all the currencies available on your site.

You should set the process currency from blank, if:

• Your payment system account only supports one currency
• Your store offers customers a choice of at least one currency that your payment system account does not support
• Your payment system provider provides very poor currency conversion rates, so you prefer to pass all orders in a single currency as customers will get better conversion rates from their credit card providers.

The process currency (if not blank) should be a three-letter ISO code for the appropriate currency.

Customers will be alerted at the last step of the checkout that the actual amount they will pay will be converted, and they will be shown the converted amount in that currency, as well as the order total in their preferred currency. This conversion will be done at the rate in your currency settings.

The settings for each payment system is stored in an XML file. This is given a .config extension so that the file contents can not be read across the web if the exact path to the file is typed into a browser. For additional security, it is advisable to encrypt this file using the checkbox provided once your site is going live.