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Need help on this PHP. If someone can fix this for me please.

https://drive.google.com/drive/folders/1Zswnlp4qwMGM31numcbDKoDZRjXm-uSx?usp=sharing

<?php
require_once ("config.php");

if (file_exists("token.json") && file_get_contents("token.json") != "")
{
    $tok_time = file_get_contents("token_expiry.txt");

    $ref_time = file_get_contents("refresh_token_expiry.txt");

    if (time() > $tok_time && time() > $ref_time)
    {
        unlink("token.json");

        unlink("token_expiry.txt");

        unlink("refresh_token_expiry.txt");

        $url = BASE_URL . "/restapi/oauth/authorize?response_type=code&client_id=" . CLIENT_ID . "&redirect_uri=" . RED_URI;

        header("Location: " . $url);

        exit();

    }
    else if (time() > $tok_time && time() < $ref_time)
    {
        $response = json_decode(file_get_contents("token.json") , true);

        $refresh_token = $response['refresh_token'];

        $response = get_Access_token_by_refresh_token($refresh_token);

        $token = $response['access_token'];

        file_put_contents("token.json", json_encode($response));

        file_put_contents("token_expiry.txt", time() + $response['expires_in']);

        file_put_contents("refresh_token_expiry.txt", time() + $response['refresh_token_expires_in']);

    }
    else
    {
        $response = json_decode(file_get_contents("token.json") , true);

        $token = $response['access_token'];

    }

}
else
{
    if (isset($_GET['code']) && $_GET['code'] != "")
    {
        $code = $_GET['code'];

        $url = BASE_URL . "/restapi/oauth/token";

        $headers = array();

        $headers[] = "Content-Type: application/x-www-form-urlencoded";

        $headers[] = "Accept: application/json";

        $headers[] = "Authorization: Basic " . base64_encode(CLIENT_ID . ":" . APP_SECRET);

        $data = array(

            "grant_type" => "authorization_code",

            "code" => $code,

            "redirect_uri" => RED_URI,

            "client_id" => CLIENT_ID

        );

        $response = curlPost($url, $headers, $data, false);

        $token = $response['access_token'];

        file_put_contents("token.json", json_encode($response));

        file_put_contents("token_expiry.txt", time() + $response['expires_in']);

        file_put_contents("refresh_token_expiry.txt", time() + $response['refresh_token_expires_in']);

        $sub = 2 * 24 * 60 * 60;

        $expiry = $response['refresh_token_expires_in'] - $sub;

        file_put_contents("expiry.txt", time() + $expiry);

        $url = "http" . (($_SERVER['SERVER_PORT'] == 443) ? "s://" : "://") . $_SERVER['HTTP_HOST'] . $_SERVER["PHP_SELF"];

        header("Location: " . $url);

    }
    else
    {
        $url = BASE_URL . "/restapi/oauth/authorize?response_type=code&client_id=" . CLIENT_ID . "&redirect_uri=" . RED_URI;

        header("Location: " . $url);

        exit();

    }

}

echo "<pre>";

$response = subscribe($token);

print_r($response);

$subscription_id = $response['id'];

$response = readPresence($token);

print_r($response);

$response = getSubscriptionid($token, $subscription_id);

print_r($response);

$response = getSubscription($token);

print_r($response);

$response = renewSubscription($token, $subscription_id);

print_r($response);

mysql_close();

function getSubscriptionid($token, $id)
{
    $url = BASE_URL . "/restapi/v1.0/subscription/$id";

    $headers = array();

    $headers[] = "Content-Type: application/json";

    $headers[] = "Authorization: Bearer " . $token;

    $headers[] = "Accept: application/json";

    $response = curlGet($url, $headers);

    return $response;

}

function curlPost($url, $header, $data, $type)
{
    $ch = curl_init();

    curl_setopt($ch, CURLOPT_URL, $url);

    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

    curl_setopt($ch, CURLOPT_HTTPHEADER, $header);

    curl_setopt($ch, CURLOPT_POST, true);

    if ($type)
    {
        curl_setopt($ch, CURLOPT_POSTFIELDS, $data);

    }
    else
    {
        curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($data));

    }

    $result = curl_exec($ch);

    $status_code = curl_getinfo($ch);

    curl_close($ch);

    $responce = json_decode($result, true);

    return ($responce);

}

function curlGet($url, $header)
{
    $ch = curl_init();

    curl_setopt($ch, CURLOPT_URL, $url);

    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

    curl_setopt($ch, CURLOPT_HTTPHEADER, $header);

    $result = curl_exec($ch);

    $status_code = curl_getinfo($ch);

    curl_close($ch);

    $responce = json_decode($result, true);

    return ($responce);

}

function get_Access_token_by_refresh_token($get_refresh_token)
{
    $url = BASE_URL . "/restapi/oauth/token";

    $headers = array();

    $auth = base64_encode(CLIENT_ID . ":" . APP_SECRET);

    $headers[] = "Content-Type: application/x-www-form-urlencoded";

    $headers[] = "Authorization: Basic " . $auth;

    $data = array(

        "grant_type" => "refresh_token",

        "refresh_token" => $get_refresh_token

    );

    $response = curlPost($url, $headers, $data, false);

    return $response;

}

/*

 Get Token

*/

function subscribe($token)
{
    $url = BASE_URL . "/restapi/v1.0/subscription";

    $headers = array();

    $headers[] = "Content-Type: application/json";

    $headers[] = "Authorization: Bearer " . $token;

    $headers[] = "Accept: application/json";

    $data = array(
        "eventFilters" => array(
            "/restapi/v1.0/account/~/presence?detailedTelephonyState=true"
        ) ,
        "deliveryMode" => array(
            "transportType" => "WebHook",
            "address" => "https://tbmslive.com/ringcentral/safeforu/webhook.php"
        )
    );

    $response = curlPost($url, $headers, json_encode($data) , true);

    return $response;

}

function readPresence($token)
{
    $url = BASE_URL . "/restapi/v1.0/account/~/extension/~/presence";

    $headers = array();

    $headers[] = "Content-Type: application/json";

    $headers[] = "Authorization: Bearer " . $token;

    $headers[] = "Accept: application/json";

    $response = curlGet($url, $headers);

    return $response;

}

function getSubscription($token)
{
    $url = BASE_URL . "/restapi/v1.0/subscription";

    $headers = array();

    $headers[] = "Content-Type: application/json";

    $headers[] = "Authorization: Bearer " . $token;

    $headers[] = "Accept: application/json";

    $response = curlGet($url, $headers);

    return $response;

}

function renewSubscription($token, $id)
{
    $url = BASE_URL . "/restapi/v1.0/subscription/$id/renew";

    $headers = array();

    $headers[] = "Content-Type: application/json";

    $headers[] = "Authorization: Bearer " . $token;

    $headers[] = "Accept: application/json";

    $data = array();

    $response = curlPost($url, $headers, json_encode($data) , true);

    return $response;

}