post https://marketplace.walmartapis.com/v3/orders//cancel
Cancel one or more order lines by providing a purchaseOrderId. After canceling the order, update the inventory for the canceled item and include it in the next inventory feed. The response to a successful call contains the order with the canceled line item. Supported cancellation reasons: ERROR_DE_PRECIO, AGOTADO, or RECHAZAR (only for orders in NEW or CREATED status)