在IAP收据验证中检测促销代码

应用内购买已成功添加到应用程序中

IAP目前处于开发模式,我将IAP收据验证放在服务器端,工作正常。

现在我想为IAP整合促销代码。但它们可以在苹果公司批准后生成(IAP审查)

问题:由于来自Apple Server的收据验证响应不包含交易金额或任何促销代码字段,我如何检测到针对交易使用了促销代码

{
  "receipt": {
    "receipt_type": "ProductionSandbox",
    "adam_id": 0,
    "app_item_id": 0,
    "bundle_id": "com.myApp",
    "application_version": "14.06",
    "download_id": 0,
    "version_external_identifier": 0,
    "receipt_creation_date": "2018-09-05 05:18:33 Etc/GMT",
    "receipt_creation_date_ms": "1536124713000",
    "receipt_creation_date_pst": "2018-09-04 22:18:33 America/Los_Angeles",
    "request_date": "2018-09-25 04:53:09 Etc/GMT",
    "request_date_ms": "1537851189557",
    "request_date_pst": "2018-09-24 21:53:09 America/Los_Angeles",
    "original_purchase_date": "2013-08-01 07:00:00 Etc/GMT",
    "original_purchase_date_ms": "1375340400000",
    "original_purchase_date_pst": "2013-08-01 00:00:00 America/Los_Angeles",
    "original_application_version": "1.0",
    "in_app": [
      {
        "quantity": "1",
        "product_id": "com.myApp.testpack",
        "transaction_id": "1000000439689939",
        "original_transaction_id": "1000000439689939",
        "purchase_date": "2018-09-05 05:03:52 Etc/GMT",
        "purchase_date_ms": "1536123832000",
        "purchase_date_pst": "2018-09-04 22:03:52 America/Los_Angeles",
        "original_purchase_date": "2018-09-05 05:03:52 Etc/GMT",
        "original_purchase_date_ms": "1536123832000",
        "original_purchase_date_pst": "2018-09-04 22:03:52 America/Los_Angeles",
        "is_trial_period": "false"
      },
      {
        "quantity": "1",
        "product_id": "com.myApp.testpack",
        "transaction_id": "1000000439690499",
        "original_transaction_id": "1000000439690499",
        "purchase_date": "2018-09-05 05:09:38 Etc/GMT",
        "purchase_date_ms": "1536124178000",
        "purchase_date_pst": "2018-09-04 22:09:38 America/Los_Angeles",
        "original_purchase_date": "2018-09-05 05:09:38 Etc/GMT",
        "original_purchase_date_ms": "1536124178000",
        "original_purchase_date_pst": "2018-09-04 22:09:38 America/Los_Angeles",
        "is_trial_period": "false"
      },
      {
        "quantity": "1",
        "product_id": "com.myApp.testpack",
        "transaction_id": "1000000439692512",
        "original_transaction_id": "1000000439692512",
        "purchase_date": "2018-09-05 05:18:01 Etc/GMT",
        "purchase_date_ms": "1536124681000",
        "purchase_date_pst": "2018-09-04 22:18:01 America/Los_Angeles",
        "original_purchase_date": "2018-09-05 05:18:01 Etc/GMT",
        "original_purchase_date_ms": "1536124681000",
        "original_purchase_date_pst": "2018-09-04 22:18:01 America/Los_Angeles",
        "is_trial_period": "false"
      }
    ]
  },
  "status": 0,
  "environment": "Sandbox"
}

我只想将交易过程中使用的优惠券代码存储在我的数据库中进行一些分析。