curl --request POST \
  --url https://api.sandbox.svrn.digital/auth \
  --header 'X-Client-Id: <x-client-id>' \
  --header 'X-Client-Secret: <x-client-secret>'

import requests

url = "https://api.sandbox.svrn.digital/auth"

headers = {
    "X-Client-Id": "<x-client-id>",
    "X-Client-Secret": "<x-client-secret>"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'X-Client-Id': '<x-client-id>', 'X-Client-Secret': '<x-client-secret>'}
};

fetch('https://api.sandbox.svrn.digital/auth', 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.sandbox.svrn.digital/auth",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_HTTPHEADER => [
    "X-Client-Id: <x-client-id>",
    "X-Client-Secret: <x-client-secret>"
  ],
]);

$response = curl_exec($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://api.sandbox.svrn.digital/auth"

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

	req.Header.Add("X-Client-Id", "<x-client-id>")
	req.Header.Add("X-Client-Secret", "<x-client-secret>")

	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.sandbox.svrn.digital/auth")
  .header("X-Client-Id", "<x-client-id>")
  .header("X-Client-Secret", "<x-client-secret>")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.sandbox.svrn.digital/auth")

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

request = Net::HTTP::Post.new(url)
request["X-Client-Id"] = '<x-client-id>'
request["X-Client-Secret"] = '<x-client-secret>'

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

{
  "access_token": "<string>",
  "token_type": "Bearer",
  "expires_in": 10800
}

{
  "error": "MISSING_FIELD",
  "message": "artist.customer_id is required"
}

{
  "error": "MISSING_FIELD",
  "message": "artist.customer_id is required"
}

{
  "error": "MISSING_FIELD",
  "message": "artist.customer_id is required"
}