curl --request GET \
  --url https://sandbox.cashfree.com/bbps/cou/v1/billers/categories \
  --header 'x-client-id: <api-key>' \
  --header 'x-client-secret: <api-key>'

import requests

url = "https://sandbox.cashfree.com/bbps/cou/v1/billers/categories"

headers = {
    "x-client-id": "<api-key>",
    "x-client-secret": "<api-key>"
}

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

print(response.text)

const options = {
  method: 'GET',
  headers: {'x-client-id': '<api-key>', 'x-client-secret': '<api-key>'}
};

fetch('https://sandbox.cashfree.com/bbps/cou/v1/billers/categories', 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.cashfree.com/bbps/cou/v1/billers/categories",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_HTTPHEADER => [
    "x-client-id: <api-key>",
    "x-client-secret: <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://sandbox.cashfree.com/bbps/cou/v1/billers/categories"

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

	req.Header.Add("x-client-id", "<api-key>")
	req.Header.Add("x-client-secret", "<api-key>")

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

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

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.get("https://sandbox.cashfree.com/bbps/cou/v1/billers/categories")
  .header("x-client-id", "<api-key>")
  .header("x-client-secret", "<api-key>")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://sandbox.cashfree.com/bbps/cou/v1/billers/categories")

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

request = Net::HTTP::Get.new(url)
request["x-client-id"] = '<api-key>'
request["x-client-secret"] = '<api-key>'

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

{
  "status": "OK",
  "message": "Biller categories fetched successfully",
  "data": [
    "Broadband Postpaid",
    "Cable TV",
    "Clubs and Associations",
    "Credit Card",
    "DTH",
    "Donation",
    "Education",
    "Electricity",
    "Fastag",
    "Gas",
    "Hospital",
    "Hospital and Pathology",
    "Insurance",
    "LPG Gas",
    "Landline Postpaid",
    "Loan Repayment",
    "Mobile Postpaid",
    "Municipal Services",
    "Municipal Taxes",
    "Recurring Deposit",
    "Rental",
    "Subscription",
    "Water"
  ]
}

{
  "message": "authentication Failed",
  "code": "request_failed",
  "type": "authentication_error"
}

{
  "message": "Too many requests from IP. Check headers",
  "code": "request_failed",
  "type": "rate_limit_error"
}

{
  "message": "internal Server Error",
  "code": "internal_error",
  "type": "api_error"
}