POST https://api.ebay.com/post-order/v2/return?fieldgroups=NONE { "returnRequest": { "itemId": "3**********4", "transactionId": "8********4", "returnQuantity": "1", "reason": "NO_LONGER_NEED_ITEM", "type": "MONEY_BACK", "carrier": "USPS", "comments": { "content": "I accidentally purchased the same product twice" } } }