An RMA system is software that allows you to set up a procedure for customers who want to make a return. They'll need to do it through the system and provide any information you request. This information can vary, but usually includes their return reason and more — and some RMA systems, like the one in Shift4Shop, let the customer upload images so you can see the condition of the item. The RMA is the central location for communications between you and the customer about the return, your tool for accepting or rejecting it, and a convenient interface for creating return labels, dispersing refunds, and receiving items back into your inventory.