If you do not want to use Stripe or PayPal as the payment method, you can select the option called invoice. When this option is selected, your customers will not be redirected to a payment interface after the order is placed, they will receive an invoice instead with the payment terms and instructions. For instance, you can specify the payment deadline and include your bank transfer information on the invoice.
To set invoice as the payment method, you can navigate to the Cogwheel Icon > E-Commerce > Payment > Payment Method. Select Invoice and then add your Invoice Due Days.
You can include your payment terms and instructions in your response email and / or on the invoice. To do so, go to E-Commerce, and then Response Email or Note on Receipt / Invoice.