Nín de dìngdān yǐtuìkuǎn, kuǎnxiàng sān rì nèi dàozhàng.
Your order has been refunded; the funds will arrive within three days.
Tips
usage
退款 (tuìkuǎn) = refund. Note that 已退款 means the merchant has issued the refund, but the buyer typically waits for 已到账 for the money to actually appear in their account.