curl --request POST \
  --url https://scx-sbx.api.jtl-software.com/v1/channel/seller \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data @- <<EOF
{
  "session": "f81d4fae-7dec-11d0-a765-00a0c91e6bf6",
  "sellerId": "4711",
  "companyName": "Bernd's brennender Brennholzverleih GmbH"
}
EOF

import requests

url = "https://scx-sbx.api.jtl-software.com/v1/channel/seller"

payload = {
    "session": "f81d4fae-7dec-11d0-a765-00a0c91e6bf6",
    "sellerId": "4711",
    "companyName": "Bernd's brennender Brennholzverleih GmbH"
}
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({
    session: 'f81d4fae-7dec-11d0-a765-00a0c91e6bf6',
    sellerId: '4711',
    companyName: 'Bernd\'s brennender Brennholzverleih GmbH'
  })
};

fetch('https://scx-sbx.api.jtl-software.com/v1/channel/seller', 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/seller",
  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([
    'session' => 'f81d4fae-7dec-11d0-a765-00a0c91e6bf6',
    'sellerId' => '4711',
    'companyName' => 'Bernd\'s brennender Brennholzverleih GmbH'
  ]),
  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/seller"

	payload := strings.NewReader("{\n  \"session\": \"f81d4fae-7dec-11d0-a765-00a0c91e6bf6\",\n  \"sellerId\": \"4711\",\n  \"companyName\": \"Bernd's brennender Brennholzverleih GmbH\"\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://scx-sbx.api.jtl-software.com/v1/channel/seller")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"session\": \"f81d4fae-7dec-11d0-a765-00a0c91e6bf6\",\n  \"sellerId\": \"4711\",\n  \"companyName\": \"Bernd's brennender Brennholzverleih GmbH\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://scx-sbx.api.jtl-software.com/v1/channel/seller")

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  \"session\": \"f81d4fae-7dec-11d0-a765-00a0c91e6bf6\",\n  \"sellerId\": \"4711\",\n  \"companyName\": \"Bernd's brennender Brennholzverleih GmbH\"\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": "GEN500",
      "message": "Internal Server Error",
      "severity": "error",
      "hint": null
    }
  ]
}