<?php

$curl = curl_init();

curl_setopt_array($curl, array(
  CURLOPT_URL => 'https://api.interakt.ai/v1/public/message/',
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => '',
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 0,
  CURLOPT_FOLLOWLOCATION => true,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => 'POST',
  CURLOPT_POSTFIELDS =>'{
    
    "userId": "",
    "fullPhoneNumber":"+919843147497",
    "callbackData": "some_callback_data",
    "type": "Text",
    "data": {
        "message": "This msg is sent via API"
    }
}',
  CURLOPT_HTTPHEADER => array(
    'Authorization: Basic Yy1Zb2xCblF2WmxhVWo3V1F5YmVUTk83VWpfdkgzYzBybUd5NEQycUNBNDo=',
    'Content-Type: application/json'
  ),
));

$response = curl_exec($curl);

curl_close($curl);
echo $response;