Return merchandise authorization
（重定向自Return Materials Authorization）
A return merchandise authorization (RMA), return authorization (RA) or return goods authorization (RGA) is a part of the process of returning a product in order to receive a refund, replacement, or repair during the product's warranty period. The purchaser of the product must contact the manufacturer (or distributor or retailer) to obtain authorization to return the product. The resulting RMA or RGA number must be displayed on or included in the returned product's packaging; no returns are accepted without this number.