curl: (60) SSL certificate problem: certificate has expired

 curl: (60) SSL certificate problem: certificate has expired

curl -I --insecure https://www.onlinepng.com/rest/default/V1/products/attributes/metal_type

$curlMetal_Type = curl_init();

curl_setopt_array($curlMetal_Type, array(

    CURLOPT_URL => 'https://www.onlinepng.com/rest/default/V1/products/attributes/metal_type',

    CURLOPT_RETURNTRANSFER => true,

    CURLOPT_ENCODING => '',

    CURLOPT_MAXREDIRS => 10,

    CURLOPT_TIMEOUT => 0,

    CURLOPT_FOLLOWLOCATION => true,

    CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,

    CURLOPT_CUSTOMREQUEST => 'GET',

    CURLOPT_HTTPHEADER => array(

        'Authorization: Bearer 0ndxl4m7tb5thn284b2two596egtynsw'

    ),

    CURLOPT_SSL_VERIFYPEER => false, // Disable SSL certificate verification

));

this is added 

CURLOPT_SSL_VERIFYPEER => false, // Disable SSL certificate verification