curl --request PUT \
  --url https://scx-sbx.api.jtl-software.com/v1/channel/shipping-rules/{sellerId} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "channelSpecificAttributeList": [
    {
      "attributeId": "OTTO_RETURN_WAREHOUSE_ID",
      "displayName": "Return Warehouse Id",
      "type": "text",
      "level": "ORDER_ITEM",
      "description": "Warehouse Id the return should be routed to",
      "enumValues": [
        {
          "value": "<string>",
          "display": "<string>",
          "sort": 0
        }
      ],
      "attributeValueValidation": "/^[0-9]{1,10}$/",
      "isMultipleAllowed": false,
      "required": false,
      "recommended": false
    }
  ]
}
'

import requests

url = "https://scx-sbx.api.jtl-software.com/v1/channel/shipping-rules/{sellerId}"

payload = { "channelSpecificAttributeList": [
        {
            "attributeId": "OTTO_RETURN_WAREHOUSE_ID",
            "displayName": "Return Warehouse Id",
            "type": "text",
            "level": "ORDER_ITEM",
            "description": "Warehouse Id the return should be routed to",
            "enumValues": [
                {
                    "value": "<string>",
                    "display": "<string>",
                    "sort": 0
                }
            ],
            "attributeValueValidation": "/^[0-9]{1,10}$/",
            "isMultipleAllowed": False,
            "required": False,
            "recommended": False
        }
    ] }
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'PUT',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    channelSpecificAttributeList: [
      {
        attributeId: 'OTTO_RETURN_WAREHOUSE_ID',
        displayName: 'Return Warehouse Id',
        type: 'text',
        level: 'ORDER_ITEM',
        description: 'Warehouse Id the return should be routed to',
        enumValues: [{value: '<string>', display: '<string>', sort: 0}],
        attributeValueValidation: '/^[0-9]{1,10}$/',
        isMultipleAllowed: false,
        required: false,
        recommended: false
      }
    ]
  })
};

fetch('https://scx-sbx.api.jtl-software.com/v1/channel/shipping-rules/{sellerId}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://scx-sbx.api.jtl-software.com/v1/channel/shipping-rules/{sellerId}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PUT",
  CURLOPT_POSTFIELDS => json_encode([
    'channelSpecificAttributeList' => [
        [
                'attributeId' => 'OTTO_RETURN_WAREHOUSE_ID',
                'displayName' => 'Return Warehouse Id',
                'type' => 'text',
                'level' => 'ORDER_ITEM',
                'description' => 'Warehouse Id the return should be routed to',
                'enumValues' => [
                                [
                                                                'value' => '<string>',
                                                                'display' => '<string>',
                                                                'sort' => 0
                                ]
                ],
                'attributeValueValidation' => '/^[0-9]{1,10}$/',
                'isMultipleAllowed' => false,
                'required' => false,
                'recommended' => false
        ]
    ]
  ]),
  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://scx-sbx.api.jtl-software.com/v1/channel/shipping-rules/{sellerId}"

	payload := strings.NewReader("{\n  \"channelSpecificAttributeList\": [\n    {\n      \"attributeId\": \"OTTO_RETURN_WAREHOUSE_ID\",\n      \"displayName\": \"Return Warehouse Id\",\n      \"type\": \"text\",\n      \"level\": \"ORDER_ITEM\",\n      \"description\": \"Warehouse Id the return should be routed to\",\n      \"enumValues\": [\n        {\n          \"value\": \"<string>\",\n          \"display\": \"<string>\",\n          \"sort\": 0\n        }\n      ],\n      \"attributeValueValidation\": \"/^[0-9]{1,10}$/\",\n      \"isMultipleAllowed\": false,\n      \"required\": false,\n      \"recommended\": false\n    }\n  ]\n}")

	req, _ := http.NewRequest("PUT", 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.put("https://scx-sbx.api.jtl-software.com/v1/channel/shipping-rules/{sellerId}")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"channelSpecificAttributeList\": [\n    {\n      \"attributeId\": \"OTTO_RETURN_WAREHOUSE_ID\",\n      \"displayName\": \"Return Warehouse Id\",\n      \"type\": \"text\",\n      \"level\": \"ORDER_ITEM\",\n      \"description\": \"Warehouse Id the return should be routed to\",\n      \"enumValues\": [\n        {\n          \"value\": \"<string>\",\n          \"display\": \"<string>\",\n          \"sort\": 0\n        }\n      ],\n      \"attributeValueValidation\": \"/^[0-9]{1,10}$/\",\n      \"isMultipleAllowed\": false,\n      \"required\": false,\n      \"recommended\": false\n    }\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://scx-sbx.api.jtl-software.com/v1/channel/shipping-rules/{sellerId}")

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

request = Net::HTTP::Put.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"channelSpecificAttributeList\": [\n    {\n      \"attributeId\": \"OTTO_RETURN_WAREHOUSE_ID\",\n      \"displayName\": \"Return Warehouse Id\",\n      \"type\": \"text\",\n      \"level\": \"ORDER_ITEM\",\n      \"description\": \"Warehouse Id the return should be routed to\",\n      \"enumValues\": [\n        {\n          \"value\": \"<string>\",\n          \"display\": \"<string>\",\n          \"sort\": 0\n        }\n      ],\n      \"attributeValueValidation\": \"/^[0-9]{1,10}$/\",\n      \"isMultipleAllowed\": false,\n      \"required\": false,\n      \"recommended\": false\n    }\n  ]\n}"

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

{
  "errorList": [
    {
      "code": "VAL100",
      "message": "Required field sellerId not found",
      "severity": "error",
      "hint": "Check the field `sellerId` — it must be a non-empty string."
    }
  ]
}

{
  "errorList": [
    {
      "code": "GEN404",
      "message": "Not found",
      "severity": "error",
      "hint": null
    }
  ]
}

{
  "errorList": [
    {
      "code": "GEN500",
      "message": "Internal Server Error",
      "severity": "error",
      "hint": null
    }
  ]
}