curl --request POST \
  --url https://scx-sbx.api.jtl-software.com/v1/seller/channel/{Channel} \
  --header 'Authorization: Bearer <token>' \
  --header 'User-Agent: <user-agent>'

import requests

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

headers = {
    "User-Agent": "<user-agent>",
    "Authorization": "Bearer <token>"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'User-Agent': '<user-agent>', Authorization: 'Bearer <token>'}
};

fetch('https://scx-sbx.api.jtl-software.com/v1/seller/channel/{Channel}', 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/seller/channel/{Channel}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "User-Agent: <user-agent>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"net/http"
	"io"
)

func main() {

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

	req, _ := http.NewRequest("POST", url, nil)

	req.Header.Add("User-Agent", "<user-agent>")
	req.Header.Add("Authorization", "Bearer <token>")

	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/seller/channel/{Channel}")
  .header("User-Agent", "<user-agent>")
  .header("Authorization", "Bearer <token>")
  .asString();

require 'uri'
require 'net/http'

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

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

request = Net::HTTP::Post.new(url)
request["User-Agent"] = '<user-agent>'
request["Authorization"] = 'Bearer <token>'

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

{
  "signUpUrl": "https://signup.mybestdeals.com/?sid=c6b28bd5-e0b4-4857-9d9c-e8a9ac40241b&expires=1557149104",
  "expiresAt": 1557149104
}

{
  "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
    }
  ]
}