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The checkout Integration method uses a secure redirection flow that sends customers to the Payblis hosted checkout page, where payment is processed and the result is returned via callback URLs.
PHP Implementation
// Set up the request parameters
$MyVars = array(
    'MerchantKey' => 'YOUR_API_KEY',
    'sandbox' => 'true', //Only for TEST MODE
    'amount' => '19.99',
    'currency' => 'EUR', //EUR,USD, CAD
    'product_name' => 'Test product',
    'method' => 'credit_cards',
    'RefOrder' => 'xxxxx',
    'Customer_Email' => 'customer@example.com',
    'Customer_Name' => 'Doe',
    'Customer_FirstName' => 'John',
    'country' => 'FR',
    'userIP' => $_SERVER['REMOTE_ADDR'],
    'lang' => 'en',
    'store_name' => 'Example Store',
    'urlOK' => 'https://your-domain.com/success',
    'urlKO' => 'https://your-domain.com/failed',
    'ipnURL' => 'https://your-domain.com/ipn'
);

// Serialize the data (convert array to string format)
$serializedData = serialize($MyVars);

// Base64 encode the serialized data directly (no URL encoding)
$encoded = base64_encode($serializedData);

// Prepare the custom payment URL
$paymentUrl = "https://pay.payblis.com/api/payment_gateway.php?token=" . $encoded;

// Redirect the user to your custom endpoint (payment page)
header("Location: " . $paymentUrl);
exit;