curl --request PUT \
  --url https://api.upstackdata.com/accounts/api/products/{productId}/{variantId}/handling-fee \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --header 'x-pixel-id: <api-key>' \
  --data '
{
  "handlingFee": 1
}
'

import requests

url = "https://api.upstackdata.com/accounts/api/products/{productId}/{variantId}/handling-fee"

payload = { "handlingFee": 1 }
headers = {
    "x-api-key": "<api-key>",
    "x-pixel-id": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'PUT',
  headers: {
    'x-api-key': '<api-key>',
    'x-pixel-id': '<api-key>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({handlingFee: 1})
};

fetch('https://api.upstackdata.com/accounts/api/products/{productId}/{variantId}/handling-fee', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.upstackdata.com/accounts/api/products/{productId}/{variantId}/handling-fee",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PUT",
  CURLOPT_POSTFIELDS => json_encode([
    'handlingFee' => 1
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "x-api-key: <api-key>",
    "x-pixel-id: <api-key>"
  ],
]);

$response = curl_exec($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.upstackdata.com/accounts/api/products/{productId}/{variantId}/handling-fee"

	payload := strings.NewReader("{\n  \"handlingFee\": 1\n}")

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

	req.Header.Add("x-api-key", "<api-key>")
	req.Header.Add("x-pixel-id", "<api-key>")
	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.put("https://api.upstackdata.com/accounts/api/products/{productId}/{variantId}/handling-fee")
  .header("x-api-key", "<api-key>")
  .header("x-pixel-id", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"handlingFee\": 1\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.upstackdata.com/accounts/api/products/{productId}/{variantId}/handling-fee")

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

request = Net::HTTP::Put.new(url)
request["x-api-key"] = '<api-key>'
request["x-pixel-id"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"handlingFee\": 1\n}"

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

{
  "variant": {
    "productId": "<string>",
    "variantId": "<string>",
    "sku": "<string>",
    "variantTitle": "<string>",
    "productTitle": "<string>",
    "handle": "<string>",
    "vendor": "<string>",
    "productType": "<string>",
    "status": "<string>",
    "tags": [
      "<string>"
    ],
    "imageUrls": [
      "<string>"
    ],
    "currency": "<string>",
    "currentPrice": 123,
    "handlingFee": 123,
    "shopifyCostHistory": [
      {
        "id": "<string>",
        "cost": 123,
        "effectiveStartDate": "<string>",
        "effectiveEndDate": "<string>",
        "description": "<string>"
      }
    ],
    "manualCostHistory": [
      {
        "id": "<string>",
        "cost": 123,
        "effectiveStartDate": "<string>",
        "effectiveEndDate": "<string>",
        "description": "<string>"
      }
    ],
    "variant": {},
    "pixelId": "<string>",
    "createdAt": "<string>",
    "updatedAt": "<string>"
  }
}

{
  "message": "<string>",
  "errors": [
    {
      "message": "<string>",
      "key": "<string>",
      "path": [
        "<string>"
      ]
    }
  ]
}

{
  "message": "<string>",
  "errors": [
    {
      "message": "<string>",
      "key": "<string>",
      "path": [
        "<string>"
      ]
    }
  ]
}

{
  "message": "<string>",
  "errors": [
    {
      "message": "<string>",
      "key": "<string>",
      "path": [
        "<string>"
      ]
    }
  ]
}