This document outlines cancellation, return, and exchange policies and procedures for an e-commerce order management system. It discusses the different reasons for cancellations, returns, or exchanges due to the buyer or seller. It provides details on refund methods and timelines by payment type. The document also describes the step-by-step processes for customers to request cancellations, returns, or exchanges and for sellers to approve, reject, or complete these requests. Standard timelines and automatic approvals are noted. Shipping fees and determining agreements between buyers and sellers are also mentioned.