curl --request POST \
  --url https://api.loopreturns.com/api/v1/labels \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "label_request_id": 67329889100573,
  "tracking_number": "9400136105440512280610",
  "carrier": "USPS",
  "label_url": "https://s3.amazonaws.com/example-bucket/label.pdf",
  "rate": [
    {
      "amount": 50000,
      "currency_code": "USD"
    },
    {
      "amount": 25000,
      "currency_code": "CAD"
    },
    {
      "amount": 1500,
      "currency_code": "EUR"
    }
  ],
  "tracking_url": "https://tools.usps.com/go/TrackConfirmAction_input?strOrigTrackNum=9400136105440512280610",
  "qrcode_url": "https://s3.amazonaws.com/example-bucket/qrcode.pdf"
}
'

import requests

url = "https://api.loopreturns.com/api/v1/labels"

payload = {
    "label_request_id": 67329889100573,
    "tracking_number": "9400136105440512280610",
    "carrier": "USPS",
    "label_url": "https://s3.amazonaws.com/example-bucket/label.pdf",
    "rate": [
        {
            "amount": 50000,
            "currency_code": "USD"
        },
        {
            "amount": 25000,
            "currency_code": "CAD"
        },
        {
            "amount": 1500,
            "currency_code": "EUR"
        }
    ],
    "tracking_url": "https://tools.usps.com/go/TrackConfirmAction_input?strOrigTrackNum=9400136105440512280610",
    "qrcode_url": "https://s3.amazonaws.com/example-bucket/qrcode.pdf"
}
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    label_request_id: 67329889100573,
    tracking_number: '9400136105440512280610',
    carrier: 'USPS',
    label_url: 'https://s3.amazonaws.com/example-bucket/label.pdf',
    rate: [
      {amount: 50000, currency_code: 'USD'},
      {amount: 25000, currency_code: 'CAD'},
      {amount: 1500, currency_code: 'EUR'}
    ],
    tracking_url: 'https://tools.usps.com/go/TrackConfirmAction_input?strOrigTrackNum=9400136105440512280610',
    qrcode_url: 'https://s3.amazonaws.com/example-bucket/qrcode.pdf'
  })
};

fetch('https://api.loopreturns.com/api/v1/labels', 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.loopreturns.com/api/v1/labels",
  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([
    'label_request_id' => 67329889100573,
    'tracking_number' => '9400136105440512280610',
    'carrier' => 'USPS',
    'label_url' => 'https://s3.amazonaws.com/example-bucket/label.pdf',
    'rate' => [
        [
                'amount' => 50000,
                'currency_code' => 'USD'
        ],
        [
                'amount' => 25000,
                'currency_code' => 'CAD'
        ],
        [
                'amount' => 1500,
                'currency_code' => 'EUR'
        ]
    ],
    'tracking_url' => 'https://tools.usps.com/go/TrackConfirmAction_input?strOrigTrackNum=9400136105440512280610',
    'qrcode_url' => 'https://s3.amazonaws.com/example-bucket/qrcode.pdf'
  ]),
  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.loopreturns.com/api/v1/labels"

	payload := strings.NewReader("{\n  \"label_request_id\": 67329889100573,\n  \"tracking_number\": \"9400136105440512280610\",\n  \"carrier\": \"USPS\",\n  \"label_url\": \"https://s3.amazonaws.com/example-bucket/label.pdf\",\n  \"rate\": [\n    {\n      \"amount\": 50000,\n      \"currency_code\": \"USD\"\n    },\n    {\n      \"amount\": 25000,\n      \"currency_code\": \"CAD\"\n    },\n    {\n      \"amount\": 1500,\n      \"currency_code\": \"EUR\"\n    }\n  ],\n  \"tracking_url\": \"https://tools.usps.com/go/TrackConfirmAction_input?strOrigTrackNum=9400136105440512280610\",\n  \"qrcode_url\": \"https://s3.amazonaws.com/example-bucket/qrcode.pdf\"\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.loopreturns.com/api/v1/labels")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"label_request_id\": 67329889100573,\n  \"tracking_number\": \"9400136105440512280610\",\n  \"carrier\": \"USPS\",\n  \"label_url\": \"https://s3.amazonaws.com/example-bucket/label.pdf\",\n  \"rate\": [\n    {\n      \"amount\": 50000,\n      \"currency_code\": \"USD\"\n    },\n    {\n      \"amount\": 25000,\n      \"currency_code\": \"CAD\"\n    },\n    {\n      \"amount\": 1500,\n      \"currency_code\": \"EUR\"\n    }\n  ],\n  \"tracking_url\": \"https://tools.usps.com/go/TrackConfirmAction_input?strOrigTrackNum=9400136105440512280610\",\n  \"qrcode_url\": \"https://s3.amazonaws.com/example-bucket/qrcode.pdf\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.loopreturns.com/api/v1/labels")

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  \"label_request_id\": 67329889100573,\n  \"tracking_number\": \"9400136105440512280610\",\n  \"carrier\": \"USPS\",\n  \"label_url\": \"https://s3.amazonaws.com/example-bucket/label.pdf\",\n  \"rate\": [\n    {\n      \"amount\": 50000,\n      \"currency_code\": \"USD\"\n    },\n    {\n      \"amount\": 25000,\n      \"currency_code\": \"CAD\"\n    },\n    {\n      \"amount\": 1500,\n      \"currency_code\": \"EUR\"\n    }\n  ],\n  \"tracking_url\": \"https://tools.usps.com/go/TrackConfirmAction_input?strOrigTrackNum=9400136105440512280610\",\n  \"qrcode_url\": \"https://s3.amazonaws.com/example-bucket/qrcode.pdf\"\n}"

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

{
  "id": 67329889100573,
  "tracking_number": "9400136105440512280610",
  "carrier": "USPS",
  "rate": [
    {
      "amount": 50000,
      "currency_code": "USD"
    },
    {
      "amount": 25000,
      "currency_code": "CAD"
    },
    {
      "amount": 1500,
      "currency_code": "EUR"
    }
  ],
  "status": "new",
  "created_at": "2023-04-25T13:25:00-05:00",
  "tracking_url": "https://tools.usps.com/go/TrackConfirmAction_input?strOrigTrackNum=9400136105440512280610",
  "label_url": "https://s3.amazonaws.com/example-bucket/label.pdf",
  "qrcode_url": "https://s3.amazonaws.com/example-bucket/qrcode.pdf"
}

{
  "errors": "Unauthorized."
}

{
  "errors": "Label request not found."
}

{
  "message": "The status field is required.",
  "errors": {
    "status": [
      "The status field is required."
    ]
  }
}

{
  "errors": "Error posting label create request."
}