The user that initiates the reservation is charged for the service. You will be asked to add your credit card before you can make a reservation. The retriever can open and pick up the content for free. The service is charged when the reservation is completed.  The service is charged every 24 hours as long as the reservation is active. 

The owner of the subscription is charged for the service. You will be asked to add your credit card when signing up. The retriever can open, pick up or return the content for free. The service is charged a month ahead for as long as the subscription is active.