John Davidson

Message:

I'm trying to validate the callback send to my website in php.

Please I'm trying to use this api documentation https://support.cryptapi.io/article/how-to-verify-the-callback-signature to validate the callback send to my website but my code keep showing error to the api

I don't know whether it from my code

<?php





$pubkey = 

"-----BEGIN PUBLIC KEY-----\nMIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC3FT0Ym8b3myVxhQW7ESuuu6lo\ndGAsUJs4fq+Ey//jm27jQ7HHHDmP1YJO7XE7Jf/0DTEJgcw4EZhJFVwsk6d3+4fy\nBsn0tKeyGMiaE6cVkX0cy6Y85o8zgc/CwZKc0uw6d5siAo++xl2zl+RGMXCELQVE\nox7pp208zTvown577wIDAQAB\n-----END PUBLIC KEY-----";       





$signature = base64_decode($_SERVER['HTTP_X_CA_SIGNATURE']);

$algo = OPENSSL_ALGO_SHA256;



// if request is GET

$data = "https://$_SERVER[HTTP_HOST]$_SERVER[REQUEST_URI]";



// if request is POST

$data = file_get_contents('php://input');



if (openssl_verify($data, $signature, $pubkey, $algo) == 1) {







require "cryptapi.php";

$url = $_GET['userdata'];



$postdata = CryptAPI\CryptAPI::process_callback($_GET);

$amount = $postdata['value_coin'];

$txid_in = $postdata['txid_in'];



$data = array(

    'amount' => $amount,

    'txid_in' => $txid_in

);



$payload = json_encode($data);



// Prepare new cURL resource

$ch = curl_init(urldecode($url));

curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

curl_setopt($ch, CURLINFO_HEADER_OUT, true);

curl_setopt($ch, CURLOPT_POST, true);

curl_setopt($ch, CURLOPT_POSTFIELDS, $payload);



// Set HTTP Header for POST request 

curl_setopt($ch, CURLOPT_HTTPHEADER, array(

    'Content-Type: application/json',

    'Content-Length: ' . strlen($payload))

);



// Submit the POST request

$result = curl_exec($ch);



// Close cURL session handle

curl_close($ch);



echo "*ok*";





} else {

echo "error";

    // signature NOT valid

}

?>

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My Answer:
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