add payment gateway and amount paid to customer order summary

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Hello - I would like to add the amount that a customer paid and the payment method/gateway to the order summary page (customers/order.liquid).

I know that this information is available on the email template that I send to the customers, but I would like them to be able to see it as well when they log in and check their order history.

Does anyone know the name of the variable that I need for the amount paid and for the gateway?

Thanks in advance! 

(Also, a larger question - is there anywhere that I can find a list of available data or variables throughout Shopify? I know that sometimes variables are not passed to certain modules, but a general list of the variables would be extremely helpful, so that I will know what I have to work with on different pages.)