const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify([
    {hts_code: '6109100040', origin_country: 'CN', ref: 'item-1'},
    {hts_code: '7208510000', origin_country: 'CN', ref: 'item-2'}
  ])
};

fetch('https://api.traddal.com/v1/us/hts/stacking/bulk', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api.traddal.com/v1/us/hts/stacking/bulk"

payload = [
    {
        "hts_code": "6109100040",
        "origin_country": "CN",
        "ref": "item-1"
    },
    {
        "hts_code": "7208510000",
        "origin_country": "CN",
        "ref": "item-2"
    }
]
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.traddal.com/v1/us/hts/stacking/bulk",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    [
        'hts_code' => '6109100040',
        'origin_country' => 'CN',
        'ref' => 'item-1'
    ],
    [
        'hts_code' => '7208510000',
        'origin_country' => 'CN',
        'ref' => 'item-2'
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.traddal.com/v1/us/hts/stacking/bulk"

	payload := strings.NewReader("[\n  {\n    \"hts_code\": \"6109100040\",\n    \"origin_country\": \"CN\",\n    \"ref\": \"item-1\"\n  },\n  {\n    \"hts_code\": \"7208510000\",\n    \"origin_country\": \"CN\",\n    \"ref\": \"item-2\"\n  }\n]")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.traddal.com/v1/us/hts/stacking/bulk")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("[\n  {\n    \"hts_code\": \"6109100040\",\n    \"origin_country\": \"CN\",\n    \"ref\": \"item-1\"\n  },\n  {\n    \"hts_code\": \"7208510000\",\n    \"origin_country\": \"CN\",\n    \"ref\": \"item-2\"\n  }\n]")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.traddal.com/v1/us/hts/stacking/bulk")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "[\n  {\n    \"hts_code\": \"6109100040\",\n    \"origin_country\": \"CN\",\n    \"ref\": \"item-1\"\n  },\n  {\n    \"hts_code\": \"7208510000\",\n    \"origin_country\": \"CN\",\n    \"ref\": \"item-2\"\n  }\n]"

response = http.request(request)
puts response.read_body

curl --request POST \
  --url https://api.traddal.com/v1/us/hts/stacking/bulk \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
[
  {
    "hts_code": "6109100040",
    "origin_country": "CN",
    "ref": "item-1"
  },
  {
    "hts_code": "7208510000",
    "origin_country": "CN",
    "ref": "item-2"
  }
]
'

{
  "success": true,
  "request_id": "c6f398bb-1dad-40e8-a991-a22a180ad842",
  "results": [
    {
      "index": 0,
      "ref": "item-1",
      "success": true,
      "hts_code": "6109100040",
      "origin_country": "CN",
      "destination_country": "US",
      "tariffs": [
        {
          "name": "<string>",
          "rate": "<string>",
          "type": "<string>",
          "code": "<string>",
          "exclusion_code": "<string>",
          "exclusion_name": "<string>"
        }
      ],
      "additional_tariff_measures": [
        {
          "code": "<string>",
          "name": "<string>",
          "description": "<string>",
          "agency": "<string>",
          "measure_type": "<string>"
        }
      ],
      "message": "Invalid hts_code"
    }
  ]
}

{
  "success": false,
  "request_id": "c6f398bb-1dad-40e8-a991-a22a180ad842",
  "error": "invalid_request",
  "message": "Invalid request parameters"
}

{
  "success": false,
  "request_id": "c6f398bb-1dad-40e8-a991-a22a180ad842",
  "error": "invalid_request",
  "message": "Invalid request parameters"
}