今天有微信好友问如何调用拼多多 API 获取指定商品的详情明细。
我之前只用过多多客的返利 API 获取商品详情，但是对于不支持返利的商品来说，用这个接口是查询不到的。
于是查看了一下拼多多开发平台中关于商品明细接口 pdd.goods.detail.get 的说明，里面注明了必须用户授权，需要用户授权才能拿到被授权的数据。另外，里面提到“新增商品或者修改商品的时候”使用，所以我猜测，每个商家只能通过接口查询自己的商品，而无法查询其他商家的商品。当然，我这只是猜测。
https://open.pinduoduo.com/#/apidocument/port?portId=pdd.goods.detail.get
不死心，我决定用我的多多客应用的 client_id 去查询商品详情，看看能否查到。
获取授权 code
授权方式文档
https://open.pinduoduo.com/#/document?url=https%253A%252F%252Fmai.pinduoduo.com%252Fautopage%252F83_static_3%252Findex.html
授权链接格式
https://jinbao.pinduoduo.com/open.html?client_id=xxx&response_type=code&redirect_uri=https://www.sunzhongwei.com
点击授权即可。如果授权成功，会返回这样的地址
https://www.sunzhongwei.com/?code=xxx
获取 access token
将上一步获取到的 code 填写进去，在命令行中调用
curl -X POST -H "Content-Type: application/json" -d '{
"client_id": "xxx",
"code": "xxx",
"grant_type": "authorization_code",
"client_secret": "xxx"
}' "http://open-api.pinduoduo.com/oauth/token"
会得到返回
{
"scope": [
"pdd.ddk.oauth.cms.prom.url.generate",
"pdd.ddk.coupon.info.query",
"pdd.ddk.order.detail.get",
"pdd.util.divide.image",
"pdd.ddk.all.order.list.increment.get",
"pdd.ddk.lottery.url.gen",
"pdd.ddk.oauth.weapp.\rqrcode.url.gen",
"pdd.ddk.oauth.lottery.url.gen",
"pdd.goods.cps.unit.create",
"pdd.goods.cps.mall.unit.change",
"pdd.goods.opt.get",
"pdd.ddk.oauth.finance.cpa.query",
"pdd.goods.cps.mall.unit.query",
"pdd.ddk.goods.zs.\runit.url.gen",
"pdd.goods.cps.mall.unit.resume",
"pdd.goods.cps.unit.query",
"pdd.ddk.goods.promotion.url.generate",
"pdd.ddk.goods.search",
"pdd.ddk.register.sms.vcode.send",
"pdd.ddk.oauth.order.detail.get",
"pdd.ddk.p\rhrase.generate",
"pdd.ddk.oauth.theme.prom.url.generate",
"pdd.ddk.goods.pid.generate",
"pdd.ddk.oauth.check.in.bill.incr.get",
"pdd.ddk.oauth.top.goods.list.query",
"pdd.goods.cps.unit.delete",
"pdd.ddk.comment.url.gen\rerate",
"pdd.ddk.oauth.comment.url.generate",
"pdd.ddk.oauth.rp.prom.url.generate",
"pdd.ddk.goods.basic.info.get",
"pdd.ddk.oauth.order.list.increment.get",
"pdd.goods.cps.unit.change",
"pdd.ddk.goods.detail",
"pdd.ddk.\roauth.goods.prom.url.generate",
"pdd.goods.cps.mall.unit.pause",
"pdd.ddk.theme.list.get",
"pdd.ddk.merchant.list.get",
"pdd.ddk.ddjb.user.register",
"pdd.ddk.cms.prom.url.generate",
"pdd.ddk.goods.game.virtual.url.gene\rrate",
"pdd.ddk.goods.sale.month.query",
"pdd.ddk.top.goods.list.query",
"pdd.ddk.oauth.goods.recommend.get",
"pdd.ddk.goods.pid.query",
"pdd.ddk.goods.recommend.get",
"pdd.ddk.theme.prom.url.generate",
"pdd.ddk.oauth.ap\rp.new.bill.list.get",
"pdd.time.get",
"pdd.ddk.oauth.goods.pid.query",
"pdd.ddk.order.list.range.get",
"pdd.ddk.order.list.increment.get",
"pdd.util.divide.base64.image",
"pdd.ddk.mall.goods.list.get",
"pdd.ddk.oauth.res\rource.url.gen",
"pdd.ddk.resource.url.gen",
"pdd.ddk.goods.unit.query",
"pdd.ddk.theme.goods.search",
"pdd.ddk.rp.prom.url.generate",
"pdd.ddk.goods.guess.like",
"pdd.ddk.mall.url.gen",
"pdd.ddk.weapp.qrcode.url.gen",
"pd\rd.goods.cats.get",
"pdd.ddk.oauth.goods.zs.unit.url.gen",
"pdd.goods.cps.mall.unit.create",
"pdd.ddjb.order.get",
"pdd.ddk.finance.cpa.query",
"pdd.ddk.oauth.mall.url.gen",
"pdd.ddk.oauth.goods.pid.generate",
"pdd.ddk.oauth.phrase.generate"
],
"access_token": "xxx",
"expires_in": 15551867,
"expires_at": 1585301165,
"refresh_token_expires_in": 15551867,
"refresh_token_expires_at": 1585301165,
"r1_expires_in": 15551867,
"r2_expires_in": 15551867,
"w1_expires_in": 15551867,
"w2_expires_in": 15551867,
"r1_expires_at": 1585301165,
"r2_expires_at": 1585301165,
"w1_expires_at": 1585301165,
"w2_expires_at": 1585301165,
"refresh_token": "xxx",
"owner_id": "xxx",
"owner_name": "xxx"
}
里面包含了 access_token 和 refresh_token。
从 scope 中看，确实没有pdd.goods.detail.get 的调用权限。
测试商品查询接口
在拼多多测试工具页
https://open.pinduoduo.com/#/apitools
按提示填写对应的信息，查询结果。。。
看来还是得用商家应用才有权限调用。
code已过期
{"error_response":{"error_code":10013,"error_msg":"code已过期"}}
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