curl --request POST \
  --url https://{defaultHost}/v1/apps/{app_id}/message_service_providers \
  --header 'Authorization: Bearer <token>' \
  --header 'X-Authorization: <api-key>'

import requests

url = "https://{defaultHost}/v1/apps/{app_id}/message_service_providers"

headers = {
    "Authorization": "Bearer <token>",
    "X-Authorization": "<api-key>"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'X-Authorization': '<api-key>'}
};

fetch('https://{defaultHost}/v1/apps/{app_id}/message_service_providers', 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/apps/{app_id}/message_service_providers",
  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>",
    "X-Authorization: <api-key>"
  ],
]);

$response = curl_exec($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://{defaultHost}/v1/apps/{app_id}/message_service_providers"

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

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("X-Authorization", "<api-key>")

	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/apps/{app_id}/message_service_providers")
  .header("Authorization", "Bearer <token>")
  .header("X-Authorization", "<api-key>")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://{defaultHost}/v1/apps/{app_id}/message_service_providers")

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

request = Net::HTTP::Post.new(url)
request["Authorization"] = 'Bearer <token>'
request["X-Authorization"] = '<api-key>'

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

{
  "message_service_provider": {
    "provider_type": "<string>",
    "config": {},
    "enabled": true,
    "name": "<string>"
  }
}

{
  "errors": "Slug / provider key is missing"
}