收银端和管理小程序都能在结账时选择优惠券（用户小程序暂不支持使用）
1、收银端：绑定会员的台桌，结账时可点击【优惠券】进行选择使用
2、管理小程序：点击【手机收银】，选择要结账的台桌，点击【结账】，选择可用优惠券即可
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