You can now receive payments for your invoices in Torch through PayPal. Under the settings tab enter your PayPal e-mail and select your currency:
When your customer looks at their invoice they have the option to pay their balance through PayPal:
Once a payment is received is shows up as part of the invoice:
Note for those using custom CSS:
The PayPal is customizable just like any other part of the invoice (the div name is "paypal").