自己的锅，没仔细看文档……
The type of purchase of the inapp product. This field is only set if this purchase was not made using the standard in-app billing flow. Possible values are:
- Test (i.e. purchased from a license testing account)
- Promo (i.e. purchased using a promo code)
只有在使用 测试环境 / 促销码 的订单 会有 purchaseType 这个值 ……
普通订单是没有这个属性的……