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WeChat Pay commodity coupon integration assistant, providing coupon type selection, API code examples (Java/Go), development parameter verification, interface error troubleshooting and launch quality inspection. Use when user mentions "商品券", "优惠券接入", "发券", "核销", "创建商品券", "商品券代码", "签名报错", "验签失败", "回调收不到", "Request-Id", "品牌直连", "服务商模式", or asks to "接入商品券", "生成发券代码", "排查接口报错", "检查签名逻辑".