addPaymentByProductIdentifiers fail {"errMsg": "takeIAPAction:failapi addPaymentByProductIdentifiers fail Can't find SKProduct in cache by productIdentifier. Please make sure productsRequest has been invoked.", "err_code": "-2"}

下面是我的代码:

 const requestObj = wx.miniapp.IAP.requestSKProducts({
      productIdentifiers: [
        'com.aizn.tech.mj.item1'
      ],
      success(ret) {
        console.log(ret.invalidProductIdentifiers)
        console.log(ret.products)


        wx.miniapp.IAP.addPaymentByProductIdentifiers({
          productIdentifier: 'com.aizn.tech.mj.item1',
       
          success: (args) => {
            // addPayment调用成功，但是不代表交易完成。
            console.log(`addPaymentByProductIdentifiers success`, args)
          },
          fail: (args) => {
            // addPayment调用成功
            console.error(`addPaymentByProductIdentifiers fail`, args)
          }
        })


      },
      fail(error) {
        console.error(`requestSKProducts failed. ${error}`)
      }
    })