Redirecting another page after if statement

I am making a page where you first select a payment method, than you get sent to the website of the bank you choose, but i can't figure out how to redirect back to another page after redirecting to the bank website. this is what i have so far:

<?php
if (!empty($_POST['Paypal'])){
    $Paypal = $_POST['Paypal'];
        if($Paypal=checked){
            Header("Location: https://www.paypal.com/");
        } 
}

if (!empty($_POST['Visa'])){
    $Visa = $_POST['Visa'];
        if($Visa=checked){
            Header("Location: https://www.visa.co.uk/");
        }
}

if (!empty($_POST['Mastercard'])){
    $Mastercard = $_POST['Mastercard'];
        if($Mastercard=checked){
            Header("Location: http://ift.tt/2eQZTTC");
        } 
}
?>

so what i am trying to get is: payment method checked > bank website > after few seconds go to confirm.php.