This is payment module for PrestaShop that allows you to add "pay by phone" method of payment.
Customers will have to call you to process the payment. his kind of payment is very popular and you can use it in a various ways. For example, you can use it to process the credit card payment via phone. Customer will have to call you and provide details about credit card (card number, cvc code). Then you will be able to charge cc in your retail store payment terminal. Of course other ways depends on your needs.
more informations about module you can find here: