Determine if the UnionPay Purchase transaction you wish to void was assisted or not by looking at the Purchase receipt. If UNIONPAY is printed under APPROVED on the receipt, then the transaction was assisted. Proceed as follows:
If the original UnionPay Purchase was not assisted, then perform a Void-Purchase as you normally would.
If the original UnionPay Purchase was assisted, then start an assisted UnionPay transaction for Void-Purchase and follow the prompts on screen. If needed, refer to the Void-Purchase transaction and to the additional prompts for UnionPay cards.