curl --request POST \
  --url https://sandbox.cashfree.com/verification/oauth/token \
  --header 'Content-Type: application/json' \
  --header 'x-client-id: <api-key>' \
  --header 'x-client-secret: <api-key>' \
  --data '
{
  "app_id": "<string>",
  "product": "VKYC",
  "metadata": {
    "vkyc_request_id": 249749
  },
  "authenticated_user": {
    "identifier_type": "mobile",
    "identifier_value": 9909490494
  }
}
'

import requests

url = "https://sandbox.cashfree.com/verification/oauth/token"

payload = {
    "app_id": "<string>",
    "product": "VKYC",
    "metadata": { "vkyc_request_id": 249749 },
    "authenticated_user": {
        "identifier_type": "mobile",
        "identifier_value": 9909490494
    }
}
headers = {
    "x-client-id": "<api-key>",
    "x-client-secret": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'x-client-id': '<api-key>',
    'x-client-secret': '<api-key>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    app_id: '<string>',
    product: 'VKYC',
    metadata: {vkyc_request_id: 249749},
    authenticated_user: {identifier_type: 'mobile', identifier_value: 9909490494}
  })
};

fetch('https://sandbox.cashfree.com/verification/oauth/token', 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/verification/oauth/token",
  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([
    'app_id' => '<string>',
    'product' => 'VKYC',
    'metadata' => [
        'vkyc_request_id' => 249749
    ],
    'authenticated_user' => [
        'identifier_type' => 'mobile',
        'identifier_value' => 9909490494
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "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"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://sandbox.cashfree.com/verification/oauth/token"

	payload := strings.NewReader("{\n  \"app_id\": \"<string>\",\n  \"product\": \"VKYC\",\n  \"metadata\": {\n    \"vkyc_request_id\": 249749\n  },\n  \"authenticated_user\": {\n    \"identifier_type\": \"mobile\",\n    \"identifier_value\": 9909490494\n  }\n}")

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

	req.Header.Add("x-client-id", "<api-key>")
	req.Header.Add("x-client-secret", "<api-key>")
	req.Header.Add("Content-Type", "application/json")

	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.cashfree.com/verification/oauth/token")
  .header("x-client-id", "<api-key>")
  .header("x-client-secret", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"app_id\": \"<string>\",\n  \"product\": \"VKYC\",\n  \"metadata\": {\n    \"vkyc_request_id\": 249749\n  },\n  \"authenticated_user\": {\n    \"identifier_type\": \"mobile\",\n    \"identifier_value\": 9909490494\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://sandbox.cashfree.com/verification/oauth/token")

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

request = Net::HTTP::Post.new(url)
request["x-client-id"] = '<api-key>'
request["x-client-secret"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"app_id\": \"<string>\",\n  \"product\": \"VKYC\",\n  \"metadata\": {\n    \"vkyc_request_id\": 249749\n  },\n  \"authenticated_user\": {\n    \"identifier_type\": \"mobile\",\n    \"identifier_value\": 9909490494\n  }\n}"

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