从Ebay SDK销售中获取已售商品 - 收到“缺少必需的输入元素”错误

我无法为 EbaySDK 创建标签，因此 Ebay API 可能会产生误导。下面是 SDK 参考。

为什么有些请求需要"输入"，在哪里可以找到它们？SDK 说明似乎不清楚每个"调用类型"需要什么。

按照 http://devbay.net/sdk/guides/getting-started/basic-usage.html#working-with-responses 中的示例，我正在尝试获取已售商品的列表。由于Ebay只保留90天的数据，所以我对我的请求没有任何限制。

他们的示例请求是：

// Create the API request object.
 $request = new Types'FindItemsByKeywordsRequest();
// Assign the keywords.
 $request->keywords = 'Harry Potter';
// Output the response from the API.
  if ($response->ack !== 'Success') {
     foreach ($response->errorMessage->error as $error) {
       printf("Error: %s'n", $error->message);
     }
    } else {
      foreach ($response->searchResult->item as $item) {
         printf("(%s) %s:%.2f'n", $item->itemId, $item->title, $item->sellingStatus->currentPrice->value);
     }
  }

我的更简单（显然不完整）

$request = new Types'GetItemStatusRequestType;
$response = $service->getItemStatus();
if ($response->Ack !== 'Success') {
    if (isset($response->Errors)) {
        foreach ($response->Errors as $error) {
            printf("Error: %s'n", $error->ShortMessage);
        }
    }
} else {
    print_r($response->getItemStatus); //should return all avail values (works with other types of requests)
}

这是令人讨厌的错误

  DTS'eBaySDK'Shopping'Types'GetItemStatusResponseType Object
(
   [values:DTS'eBaySDK'Types'BaseType:private] => Array
       (
          [Timestamp] => DateTime Object
            (
                [date] => 2016-03-23 00:28:28.391000
                [timezone_type] => 2
                [timezone] => Z
            )
        [Ack] => Failure
        [Errors] => DTS'eBaySDK'Types'UnboundType Object
            (
                [data:DTS'eBaySDK'Types'UnboundType:private] => Array
                    (
                        [0] => DTS'eBaySDK'Shopping'Types'ErrorType Object
                            (
                                [values:DTS'eBaySDK'Types'BaseType:private] => Array
                                    (
                                        [ShortMessage] => Missing required input element.
                                        [LongMessage] => Required input element is missing from the request.
                                        [ErrorCode] => 1.19
                                        [SeverityCode] => Error
                                        [ErrorParameters] => DTS'eBaySDK'Types'UnboundType Object
                                            (
                                                [data:DTS'eBaySDK'Types'UnboundType:private] => Array
                                                    (
                                                        [0] => DTS'eBaySDK'Shopping'Types'ErrorParameterType Object
                                                            (
                                                                [values:DTS'eBaySDK'Types'BaseType:private] => Array
                                                                    (
                                                                        [ParamID] => 0
                                                                        [Value] => ItemID
                                                                    )
                                                                [attachment:DTS'eBaySDK'Types'BaseType:private] => Array
                                                                    (
                                                                        [data] => 
                                                                        [mimeType] => 
                                                                    )
                                                            )
                                                    )
                                                [position:DTS'eBaySDK'Types'UnboundType:private] => 0
                                                [class:DTS'eBaySDK'Types'UnboundType:private] => DTS'eBaySDK'Shopping'Types'ErrorType
                                                [property:DTS'eBaySDK'Types'UnboundType:private] => ErrorParameters
                                                [expectedType:DTS'eBaySDK'Types'UnboundType:private] => DTS'eBaySDK'Shopping'Types'ErrorParameterType
                                            )
                                        [ErrorClassification] => RequestError
                                    )
                                [attachment:DTS'eBaySDK'Types'BaseType:private] => Array
                                    (
                                        [data] => 
                                        [mimeType] => 
                                    )
                            )
                    )
                [position:DTS'eBaySDK'Types'UnboundType:private] => 0
                [class:DTS'eBaySDK'Types'UnboundType:private] => DTS'eBaySDK'Shopping'Types'GetItemStatusResponseType
                [property:DTS'eBaySDK'Types'UnboundType:private] => Errors
                [expectedType:DTS'eBaySDK'Types'UnboundType:private] => DTS'eBaySDK'Shopping'Types'ErrorType
            )
        [Build] => E949_CORE_APILW_17769283_R1
        [Version] => 949
    )
[attachment:DTS'eBaySDK'Types'BaseType:private] => Array
    (
        [data] => 
        [mimeType] => 
    )
)

错误：缺少必需的输入元素。

似乎我不是在要求什么，但我不知道。