All accepted methods of payment must be added under your payment methods under your financial and payments settings. Options provided in this list will appear on each transaction, allowing you to choose the preferred method of payment when collecting a payment on an order or invoice. The most common types will already be listed in your account (cash or check), but you can add or remove depending on the payment methods you accept.
Please note that although you can add credit card as an option in this menu, in order to collect credit card payments through your Rentopian account you'll need to first set up your Payment Gateway. If you are accepting credit card payments on an external terminal, you can add a payment type named as the external terminal and have the Rentopian system mark it the same as cash. This will enable you to properly reference the payment.