curl --request POST \
  --url https://sandbox-biller-b2b.singapay.id/api/v1.0/access-token/b2b \
  --header 'Authorization: Basic <encoded-value>' \
  --header 'Content-Type: <content-type>' \
  --header 'X-PARTNER-ID: <x-partner-id>' \
  --data '
{
  "grant_type": "client_credentials"
}
'

import requests

url = "https://sandbox-biller-b2b.singapay.id/api/v1.0/access-token/b2b"

payload = { "grant_type": "client_credentials" }
headers = {
    "X-PARTNER-ID": "<x-partner-id>",
    "Content-Type": "<content-type>",
    "Authorization": "Basic <encoded-value>"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'X-PARTNER-ID': '<x-partner-id>',
    'Content-Type': '<content-type>',
    Authorization: 'Basic <encoded-value>'
  },
  body: JSON.stringify({grant_type: 'client_credentials'})
};

fetch('https://sandbox-biller-b2b.singapay.id/api/v1.0/access-token/b2b', 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://sandbox-biller-b2b.singapay.id/api/v1.0/access-token/b2b",
  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([
    'grant_type' => 'client_credentials'
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Basic <encoded-value>",
    "Content-Type: <content-type>",
    "X-PARTNER-ID: <x-partner-id>"
  ],
]);

$response = curl_exec($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://sandbox-biller-b2b.singapay.id/api/v1.0/access-token/b2b"

	payload := strings.NewReader("{\n  \"grant_type\": \"client_credentials\"\n}")

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

	req.Header.Add("X-PARTNER-ID", "<x-partner-id>")
	req.Header.Add("Content-Type", "<content-type>")
	req.Header.Add("Authorization", "Basic <encoded-value>")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://sandbox-biller-b2b.singapay.id/api/v1.0/access-token/b2b")
  .header("X-PARTNER-ID", "<x-partner-id>")
  .header("Content-Type", "<content-type>")
  .header("Authorization", "Basic <encoded-value>")
  .body("{\n  \"grant_type\": \"client_credentials\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://sandbox-biller-b2b.singapay.id/api/v1.0/access-token/b2b")

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

request = Net::HTTP::Post.new(url)
request["X-PARTNER-ID"] = '<x-partner-id>'
request["Content-Type"] = '<content-type>'
request["Authorization"] = 'Basic <encoded-value>'
request.body = "{\n  \"grant_type\": \"client_credentials\"\n}"

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

{
  "status": 200,
  "success": true,
  "data": {
    "access_token": "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9...",
    "token_type": "Bearer",
    "expires_in": "3600"
  }
}

{
  "status": 401,
  "success": false,
  "error": {
    "code": 401,
    "message": "Invalid credentials"
  }
}

{
  "status": 401,
  "success": false,
  "error": {
    "code": 401,
    "message": "Invalid credentials"
  }
}