"输入源“/body/sub_mchid”映射到字段“子商户号/二级商户号”必填性规则校验失败，此字段为必填项\
为什么还需要二级商户号，我现在有商户号无法下单操作吗？
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和你调用接口有关系，你需要确认你的商户号类型以及你调用的接口