amazon-mws: GetMyFees Estimate error

let accessSecret = process.env.AWS_SECRET_ACCESS_KEY;

const amazonMws = require("amazon-mws")(accessKey, accessSecret);

let feesLookUp = async (req, res) => {
  const { ASIN, inputPrice } = req.body;
  //   console.log("res", ASIN, inputPrice);

  await amazonMws.products.searchFor(
    {
      Version: "2011-10-01",
      Action: "GetMyFeesEstimate",
      SellerId: process.env.MWS_SELLER_ID,
      "FeesEstimateRequestList.FeesEstimateRequest.1.MarketplaceId":
        process.env.MWS_MARKETPLACE_ID,
      "FeesEstimateRequestList.FeesEstimateRequest.1.IdType": "ASIN",
      "FeesEstimateRequestList.FeesEstimateRequest.1.IdValue": "ASIN",
      "FeesEstimateRequestList.FeesEstimateRequest.1.IsAmazonFulfilled": true,
      "FeesEstimateRequestList.FeesEstimateRequest.1.Identifier": "Hello",
      "FeesEstimateRequestList.FeesEstimateRequest.1.PriceToEstimateFees.ListingPrice.CurrencyCode":
        "USD",
      "FeesEstimateRequestList.FeesEstimateRequest.1.PriceToEstimateFees.ListingPrice.Amount": inputPrice,
      "FeesEstimateRequestList.FeesEstimateRequest.1.PriceToEstimateFees.Shipping.CurrencyCode":
        "USD",
      "FeesEstimateRequestList.FeesEstimateRequest.1.PriceToEstimateFees.Shipping.Amount":
        "0",
      "FeesEstimateRequestList.FeesEstimateRequest.1.PriceToEstimateFees.Points.PointsNumber":
        "0",
      "FeesEstimateRequestList.FeesEstimateRequest.1.PriceToEstimateFees.Points.PointsMonetaryValue.Amount":
        "0",
      "FeesEstimateRequestList.FeesEstimateRequest.1.PriceToEstimateFees.Points.PointsMonetaryValue.CurrencyCode":
        "USD"
    },
    function(error, response) {
      console.log("res2", response);

      if (error) {
        console.log("error products", error);
        return;
      }
      console.log("response ", response);
    }
  );
};

module.exports = {
  feesLookUp
};

I have tried alot of different possibilities with strings and no strings but no luck. This is my error which is internal here and my scratchpad works. I also got ListMatchingProducts to work so i know my keys are fine. Also the console log is null but my req.body is consoled log from postman just fine.

  Headers:
   { 'x-mws-quota-max': '36000.0',
     'x-mws-quota-remaining': '35997.0',
     'x-mws-quota-resetson': '2019-02-13T02:52:00.000Z',
     'x-mws-timestamp': '2019-02-13T02:03:05.895Z',
     'content-type': 'unknown',
     'content-charset': 'unknown',
     'content-length': 'unknown',
     'content-md5': 'unknown',
     date: 'Wed, 13 Feb 2019 02:03:05 GMT' },
  StatusCode: 500 }```