使用Amazon SP API添加商品报价至库存失败问题排查

我正在使用Node.js编写代码管理亚马逊卖家平台库存，目前通过手动提交CSV文件管理商品报价（CD、DVD、唱片）。尝试使用Amazon SP API实现该功能但未成功，请求示例如下：

const body = {
  "productType":"PRODUCT",
  "product_type":"PRODUCT",
  "requirements":"LISTING_OFFER_ONLY",
  "attributes":{
    "condition_type":[
      {"value":"used_acceptable","marketplace_id":"APJ6JRA9NG5V4"}
    ]
  },
  "offers":[
    {"marketplaceId":"APJ6JRA9NG5V4","offerType":"B2C","price":{"currencyCode":"EUR","amount":20.99}}
  ]
};

var config = {
    method: 'PUT',
    url: `https://sellingpartnerapi-eu.amazon.com/listings/2021-08-01/items/A23B5NP94ZWC8W/${sku}?marketplaceIds=${marketplaceIds}&issueLocale=en_US`,
    headers: {
        'Accept': 'application/json',
        'x-amz-access-token': access_token,
        'X-Amz-Date': awssign.headers["X-Amz-Date"],
        'Authorization': `${awssign.headers.Authorization}`,
        "Content-Type":'application/json'
    },
    data: body
};

await axios(config);

收到的错误响应：

{
  "sku": "AAACD100249",
  "status": "INVALID",
  "submissionId": "b3e9b60a2e0c41ad804d17795b0f5f41",
  "issues": [
    {
      "code": "90220",
      "message": "'merchant_suggested_asin' is required but not supplied.",
      "severity": "ERROR",
      "attributeNames": ["merchant_suggested_asin"]
    },
    {
      "code": "90220",
      "message": "'externally_assigned_product_identifier' is required but not supplied.",
      "severity": "ERROR",
      "attributeNames": ["externally_assigned_product_identifier"]
    }
  ]
}

该商品已存在且ASIN有效，我无需创建新商品，仅需添加报价。官方文档未提供有效帮助，请问缺失哪些参数？当前方式是否正确？

缺失参数说明 #

1. merchant_suggested_asin：即使商品已存在，使用LISTING_OFFER_ONLY要求时仍需明确指定关联的ASIN。将此字段添加到attributes中，值为SKU对应的有效ASIN：

   "attributes": {
     "condition_type": [{"value":"used_acceptable","marketplace_id":"APJ6JRA9NG5V4"}],
     "merchant_suggested_asin": [{"value":"目标ASIN值","marketplace_id":"APJ6JRA9NG5V4"}]
   }
   

2. externally_assigned_product_identifier：对应商品的外部标准标识（如UPC、EAN），CD/DVD这类标品必须提供该参数。同样添加到attributes中：

   "attributes": {
     // 已有字段...
     "externally_assigned_product_identifier": [{"value":"商品的UPC/EAN码","marketplace_id":"APJ6JRA9NG5V4"}]
   }
   

请求方式正确性 #

你使用PUT请求是正确的，该方法支持创建或更新商品列表/报价。额外注意两点：

• requirements设置为LISTING_OFFER_ONLY符合仅更新报价的需求，无需调整。
• 确认URL中的卖家ID（A23B5NP94ZWC8W）和marketplaceIds参数与实际运营区域匹配，避免跨环境错误。

修改后的完整请求体示例：

{
  "productType": "PRODUCT",
  "requirements": "LISTING_OFFER_ONLY",
  "attributes": {
    "condition_type": [{"value":"used_acceptable","marketplace_id":"APJ6JRA9NG5V4"}],
    "merchant_suggested_asin": [{"value":"B0XXXXXXX","marketplace_id":"APJ6JRA9NG5V4"}],
    "externally_assigned_product_identifier": [{"value":"1234567890123","marketplace_id":"APJ6JRA9NG5V4"}]
  },
  "offers": [{"marketplaceId":"APJ6JRA9NG5V4","offerType":"B2C","price":{"currencyCode":"EUR","amount":20.99}}]
}

注：已移除重复的product_type字段（与productType冗余）。

内容的提问来源于stack exchange，提问作者Edoardo Lobbiani