Pattern Dosen't Match - Schedule Campaign

Pattern Dosen't Match - Schedule Campaign

ScheduleCampaign.php

$url = 'https://campaigns.zoho.com/api/v1.1/sendcampaign?isschedule=true';

$header = array(
    'Content-Type: application/x-www-form-urlencoded',
    'Authorization: Zoho-oauthtoken '.$access_token,
);

// Initialize cURL request and set parameters
$ch = curl_init($url);
curl_setopt_array($ch, array(
    CURLOPT_POST           => 1,
    CURLOPT_POSTFIELDS     => http_build_query(array(
        'resfmt' => 'json',
        'campaignkey' => $campaign_key,
        'scheduleDate' => '01/11/2020',
        'scheduleHour' => '01',
        'scheduleMinute' => '10',
        'am_pm' => 'pm',
        'sendingTZ' => 'Asia/Kolkata'
    )),
    CURLOPT_URL            => $url,
    CURLOPT_HTTPHEADER     => $header,
    CURLOPT_HEADER         => 0,
    CURLOPT_RETURNTRANSFER => TRUE,
    CURLOPT_TIMEOUT        => 30,
    CURLOPT_USERAGENT      => 'Mozilla/4.0 (compatible; MSIE 5.01; Windows NT 5.0)'
));

$server_output = curl_exec($ch);
curl_close($ch);
It always return response as below,
stdClass Object
(
    [message] => Pattern doesn't Match
    [version] => 1.1
    [URI] => /api/v1.1/sendcampaign
    [Code] => 1001
    [status] => error
)
Kindly check the code if anything missing or is any kind of API error. If any possible sollution available then kindly reply ASAP.