curl --request POST \
  --url https://{defaultHost}/v1/return_requests \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "return_request": {
    "order": "213066ed-6936-4dab-9f12-a581ffdcc375",
    "return_items": [
      {
        "line_item": "c9857aaa-8412-40f9-931c-f0e1d8bfe33f",
        "quantity": 1,
        "return_reason_id": "wrong_item"
      }
    ]
  }
}
'

import requests

url = "https://{defaultHost}/v1/return_requests"

payload = { "return_request": {
        "order": "213066ed-6936-4dab-9f12-a581ffdcc375",
        "return_items": [
            {
                "line_item": "c9857aaa-8412-40f9-931c-f0e1d8bfe33f",
                "quantity": 1,
                "return_reason_id": "wrong_item"
            }
        ]
    } }
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({
    return_request: {
      order: '213066ed-6936-4dab-9f12-a581ffdcc375',
      return_items: [
        {
          line_item: 'c9857aaa-8412-40f9-931c-f0e1d8bfe33f',
          quantity: 1,
          return_reason_id: 'wrong_item'
        }
      ]
    }
  })
};

fetch('https://{defaultHost}/v1/return_requests', 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://{defaultHost}/v1/return_requests",
  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([
    'return_request' => [
        'order' => '213066ed-6936-4dab-9f12-a581ffdcc375',
        'return_items' => [
                [
                                'line_item' => 'c9857aaa-8412-40f9-931c-f0e1d8bfe33f',
                                'quantity' => 1,
                                'return_reason_id' => 'wrong_item'
                ]
        ]
    ]
  ]),
  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://{defaultHost}/v1/return_requests"

	payload := strings.NewReader("{\n  \"return_request\": {\n    \"order\": \"213066ed-6936-4dab-9f12-a581ffdcc375\",\n    \"return_items\": [\n      {\n        \"line_item\": \"c9857aaa-8412-40f9-931c-f0e1d8bfe33f\",\n        \"quantity\": 1,\n        \"return_reason_id\": \"wrong_item\"\n      }\n    ]\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://{defaultHost}/v1/return_requests")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"return_request\": {\n    \"order\": \"213066ed-6936-4dab-9f12-a581ffdcc375\",\n    \"return_items\": [\n      {\n        \"line_item\": \"c9857aaa-8412-40f9-931c-f0e1d8bfe33f\",\n        \"quantity\": 1,\n        \"return_reason_id\": \"wrong_item\"\n      }\n    ]\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://{defaultHost}/v1/return_requests")

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  \"return_request\": {\n    \"order\": \"213066ed-6936-4dab-9f12-a581ffdcc375\",\n    \"return_items\": [\n      {\n        \"line_item\": \"c9857aaa-8412-40f9-931c-f0e1d8bfe33f\",\n        \"quantity\": 1,\n        \"return_reason_id\": \"wrong_item\"\n      }\n    ]\n  }\n}"

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

{
  "id": "e3b70852-0b80-4798-9355-1cbacf4ee885",
  "object": "return_request",
  "number": "0000-R1",
  "status": "open",
  "order": "213066ed-6936-4dab-9f12-a581ffdcc375",
  "created_at": 1782485892,
  "updated_at": 1782485892
}