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The IP address of the merchant site must be whitelisted by Blink.

The merchant site must have a valid SSL (for 3DS transactions).

<?PHP


//Merchant ID 
 $merchantID = '233508';

 // Merchant Signature key,
 $key = '<T4NW>)dic';

 // Gateway URL
 $url = 'https://gateway2.blinkpayment.co.uk/hosted/modal';


 if (!isset($_POST['responseCode'])) {
 // Send request to gateway

 // Request
 $req = array(
 'merchantID' => $merchantID,
 'action' => 'SALE',
 'type' => 1,
 'countryCode' => 826,
 'currencyCode' => 826,
 'amount' => 1001,
 'orderRef' => 'Test purchase',
 'transactionUnique' => uniqid(),
 'redirectURL' => ($_SERVER['HTTPS'] == 'on' ? 'https' : 'http') . '://' . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'],
 );

 // Create the signature using the function called below.
 $req['signature'] = createSignature($req, $key);

 echo '<form action="' . htmlentities($url) . '" method="post">' . PHP_EOL;

 foreach ($req as $field => $value) {
 echo ' <input type="hidden" name="' . $field . '" value="' . htmlentities($value) . '">' . PHP_EOL;
 }

 echo ' <input type="submit" value="Pay Now">' . PHP_EOL;
 echo '</form>' . PHP_EOL;

 // Check the return signature
 if (!$signature || $signature !== createSignature($res, $key)) {
 // You should exit gracefully
 die('Sorry, the signature check failed');
 }

 // Check the response code
 if ($res['responseCode'] === "0") {
 echo "<p>Thank you for your payment.</p>";
 } else {
 echo "<p>Failed to take payment: " . htmlentities($res['responseMessage']) . "</p>";
 }

 }

 // Function to create a message signature
 function createSignature(array $data, $key) {
 // Sort by field name
 ksort($data);

 // Create the URL encoded signature string
 $ret = http_build_query($data, '', '&');

 // Normalise all line endings (CRNL|NLCR|NL|CR) to just NL (%0A)
 $ret = str_replace(array('%0D%0A', '%0A%0D', '%0D'), '%0A', $ret);

 // Hash the signature string and the key together
 return hash('SHA512', $ret . $key);
 }

 ?>

<?PHP
// Gateway Merchant ID
$merchantID = '233508';
 // Signature key. The demo account is fixed to this value,
 $key = '<T4NW>)dic';
// If you don't know your Merchant ID or signature key, please be in touch.
 // Gateway URL
 $url = 'https://gateway2.blinkpayment.co.uk/direct/';

 
 // Setup PHP session as use it to store data between 3DS steps
 if (isset($_GET['sid'])) {
 session_id($_GET['sid']);
 }

 session_start();

 // Compose current page URL (removing any sid and acs parameters)
 $pageURL = ((isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') ? 'https://' : 'http://')  . $_SERVER['SERVER_NAME'] . ($_SERVER['SERVER_PORT'] != '80' ? ':' . $_SERVER['SERVER_PORT'] : '')  . preg_replace('/(sid=[^&]+&?)|(acs=1&?)/', '', $_SERVER['REQUEST_URI']);
 // Add back the correct sid parameter (used as session cookie may not be passed when the page is redirected from an IFRAME)

 $pageURL .= (strpos($pageURL, '?') === false ? '?' : '&') . 'sid=' . URLencode(session_id());
 

 // If ACS response into the IFRAME then redirect back to parent window
 if (!empty($_GET['acs'])) {
 echo silentPost($pageURL, array('threeDSResponse' => $_POST), '_parent');
 exit();
 }

 if (!isset($_POST['threeDSResponse'])) {
 // Initial request

 // Gather browser info - can be done at any time prior to the checkout
 if (!isset($_POST['browserInfo'])) {
 echo collectBrowserInfo();
 exit();
 }

 // Direct Request
 $req = array(
 'merchantID' => $merchantID,
 'action' => 'SALE',
 'type' => 1,
 'currencyCode' => 826,
 'countryCode' => 826,
 'amount' => 901,
 'cardNumber' => '4543059999999990',
 'cardExpiryMonth' => 12,
 'cardExpiryYear' => 22,
 'cardCVV' => '689',
 'customerName' => 'Test Customer',
 'customerEmail' => 'test@testcustomer.com',
 'customerAddress' => '16 Test Street',
 'customerPostCode' => 'Tef 5ST',
 'orderRef' => '3DS test purchase',

 // The following fields are mandatory for 3DS v2
 'remoteAddress' => $_SERVER['REMOTE_ADDR'],
 'threeDSRedirectURL' => $pageURL . '&acs=1',

 // The following field allows options to be passed for 3DS v2
 // and the values here are for demonstration purposes only
 'threeDSOptions' => array(
 'paymentAccountAge' => '20190601',
 'paymentAccountAgeIndicator' => '05',
 ),
 );

 // Add the browser info as it is mandatory for 3DS v2
 $req += $_POST['browserInfo'];

 } else {
 // 3DS continuation request
 $req = array(
 'threeDSRef' => $_SESSION['threeDSRef'],
 'threeDSResponse' => $_POST['threeDSResponse'],
 );

 }

 // Create the signature using the function called below.
 $req['signature'] = createSignature($req, $key);

 // Initiate and set cURL options to post to the gateway
 $ch = cURL_init($url);
 cURL_setopt($ch, CURLOPT_POST, true);
 cURL_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($req));
 cURL_setopt($ch, CURLOPT_HEADER, false);
 cURL_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
 cURL_setopt($ch, CURLOPT_RETURNTRANSFER, true);

 // Send the request and parse the response
 if (($res = cURL_exec($ch)) === false) {
 // You should exit gracefully
 die('Sorry, the request could not be sent: ' . cURL_error($ch));
 }

 parse_str($res, $res);

// Close the connection to the gateway
cURL_close($ch);

// Extract the return signature as this isn't hashed
$signature = null;
if (isset($res['signature'])) {
 $signature = $res['signature'];
 unset($res['signature']);
}

// Check the return signature
if (!$signature || $signature !== createSignature($res, $key)) {
 // You should exit gracefully
 die('Sorry, the signature check failed');
}

// Check the response code
if ((int)$res['responseCode'] === 65802) {
 // Send request to the ACS server displaying response in an IFRAME

 // Render an IFRAME to show the ACS challenge (hidden for fingerprint method)
 $style = (isset($res['threeDSRequest']['threeDSMethodData']) ? 'display: none;' : '');
 echo "<iframe name=\"threeds_acs\" style=\"height:420px; width:420px; {$style}\"></iframe>\n";

 // Silently POST the 3DS request to the ACS in the IFRAME
 echo silentPost($res['threeDSURL'], $res['threeDSRequest'], 'threeds_acs');

 // Remember the threeDSRef as need it when the ACS responds
 $_SESSION['threeDSRef'] = $res['threeDSRef'];

} else if ((int)$res['responseCode'] === 0) {
 echo "<p>Thank you for your payment.</p>";
} else {
    echo $res['responseCode'];
    
 echo "<p>Failed to take payment: :( " . htmlentities($res['responseMessage']) . "</p>";
}

// Function to create a message signature
function createSignature(array $data, $key) {
 // Sort by field name
 ksort($data);

 // Create the URL encoded signature string
 $ret = http_build_query($data, '', '&');

 // Normalise all line endings (CRNL|NLCR|NL|CR) to just NL (%0A)
 $ret = str_replace(array('%0D%0A', '%0A%0D', '%0D'), '%0A', $ret);

 // Hash the signature string and the key together
 return hash('SHA512', $ret . $key);
}

// Return HTML to render a hidden form used to collect some browser details
function collectBrowserInfo(array $options = null) {

 $form_attrs = 'id="collectBrowserInfo" method="post" action="?"';

 if (isset($options['formAttrs'])) {
 $form_attrs .= $options['formAttrs'];
 }

 $device_data = array(
 'deviceChannel' => 'browser',
 'deviceIdentity' => (isset($_SERVER['HTTP_USER_AGENT']) ? htmlentities($_SERVER['HTTP_USER_AGENT']) : null),
 'deviceTimeZone' => '0',
 'deviceCapabilities' => '',
 'deviceScreenResolution' => '1x1x1',
 'deviceAcceptContent' => (isset($_SERVER['HTTP_ACCEPT']) ? htmlentities($_SERVER['HTTP_ACCEPT']): null),
 'deviceAcceptEncoding' => (isset($_SERVER['HTTP_ACCEPT_ENCODING']) ? htmlentities($_SERVER['HTTP_ACCEPT_ENCODING']) : null),
 'deviceAcceptLanguage' => (isset($_SERVER['HTTP_ACCEPT_LANGUAGE']) ? htmlentities($_SERVER['HTTP_ACCEPT_LANGUAGE']) : null),
 'deviceAcceptCharset' => (isset($_SERVER['HTTP_ACCEPT_CHARSET']) ? htmlentities($_SERVER['HTTP_ACCEPT_CHARSET']) : null),
 );

 $form_fields = fieldToHtml('browserInfo', $device_data);

 if (isset($options['formData'])) {
 foreach ((array)$options['formData'] as $name => $value) {
 $form_fields .= fieldToHtml($name, $value);
 }
 }

 $ret = <<<EOS
 <form {$form_attrs}>
 {$form_fields}
 </form>
 <script>
 var screen_width = (window && window.screen ? window.screen.width : '0');
 var screen_height = (window && window.screen ? window.screen.height : '0');
 var screen_depth = (window && window.screen ? window.screen.colorDepth : '0');
 var identity = (window && window.navigator ? window.navigator.userAgent : '');
 var language = (window && window.navigator ? (window.navigator.language ? window.navigator.language : window.navigator.browserLanguage) : '');
 var timezone = (new Date()).getTimezoneOffset();
 var java = (window && window.navigator ? navigator.javaEnabled() : false);
 var fields = document.forms.collectBrowserInfo.elements;
 fields['browserInfo[deviceIdentity]'].value = identity;
 fields['browserInfo[deviceTimeZone]'].value = timezone;
 fields['browserInfo[deviceCapabilities]'].value = 'javascript' + (java ? ',java' : '');
 fields['browserInfo[deviceAcceptLanguage]'].value = language;
 fields['browserInfo[deviceScreenResolution]'].value = screen_width + 'x' + screen_height + 'x' + screen_depth;
 window.setTimeout('document.forms.collectBrowserInfo.submit()', 0);
 </script>
EOS;

 return $ret;
}

// Render HTML to silently POST data to URL in target brower window
function silentPost($url = '?', array $post = null, $target = '_self') {

 $url = htmlentities($url);
 $target = htmlentities($target);
 $fields = '';

 if ($post) {
 foreach ($post as $name => $value) {
 $fields .= fieldToHtml($name, $value);
 }
 }

 $ret = "
 <form id=\"silentPost\" action=\"{$url}\" method=\"post\" target=\"{$target}\">
 {$fields}
 <noscript><input type=\"submit\" value=\"Continue\"></noscript>
 </form>
 <script>
 window.setTimeout('document.forms.silentPost.submit()', 0);
 </script>
 ";

 return $ret;
}

// Return a value as hidden HTML FORM fields
function fieldToHtml($name, $value) {
 $ret = '';
 if (is_array($value)) {
 foreach ($value as $n => $v) {
 $ret .= fieldToHtml($name . '[' . $n . ']', $v);
 }
 } else {
 // Convert all applicable characters or none printable characters to HTML entities
if(!$value) $value = " ";
 $value = preg_replace_callback('/[\x00-\x1f]/', function($matches) { return '&#' . ord($matches[0]) .';'; }, htmlentities($value, ENT_COMPAT, 'UTF-8', true));

 $ret = "<input type=\"hidden\" name=\"{$name}\" value=\"{$value}\" />\n";
 }

 return $ret;
}


?>