The document says the environment will be `PROD` and `SANDBOX`, but the notification from Apple's server is:
%{"auto_renew_product_id" => "io.example.pro",
"auto_renew_status" => "true", "environment" => "Sandbox",
"latest_receipt" => "RECEIPT",
"latest_receipt_info" => %{"bid" => "io.example", "bvrs" => "41",
"expires_date" => "1502767605000",
"expires_date_formatted" => "2017-08-15 03:26:45 Etc/GMT",
"expires_date_formatted_pst" => "2017-08-14 20:26:45 America/Los_Angeles",
"item_id" => "1243267094",
"original_purchase_date" => "2017-06-16 06:27:05 Etc/GMT",
"original_purchase_date_ms" => "1497594425000",
"original_purchase_date_pst" => "2017-06-15 23:27:05 America/Los_Angeles",
"original_transaction_id" => "1000000307712301",
"product_id" => "io.example.pro",
"purchase_date" => "2017-08-15 03:21:45 Etc/GMT",
"purchase_date_ms" => "1502767305000",
"purchase_date_pst" => "2017-08-14 20:21:45 America/Los_Angeles",
"quantity" => "1", "transaction_id" => "1000000324426003",
"unique_identifier" => "becd78c1c419a7d75c128e5306762da1ac9c9cba",
"unique_vendor_identifier" => "F8EACBA7-4637-4A49-929D-B30013F35D5F",
"web_order_line_item_id" => "1000000035380472"},
"notification_type" => "INTERACTIVE_RENEWAL",
"password" => "PASSWORD"}
Which the environment is `Sandbox`, which is inconsistent with the document.