How to process Paypal Checkout to paypal app instead of web browser - php

Question

Okay, so I have a unique issue with Paypal. I have a payment form that is working just fine. But I want something like, when people hit the payment button from their mobile it would take them straightly to their installed Paypal app to process the payment. For desktop, the browser is okay.
Can anybody help me anyhow with this? I don't even know if this is possible without SDK. I am using simple payment form
<?php
$paypalData = getPaypalData($userid);
$paypalurl = 'https://www.paypal.com/cgi-bin/webscr';
$paypalSandboxurl = 'https://www.sandbox.paypal.com/cgi-bin/webscr';
?>
<form action="<?=$paypalurl;?>" method="post" target="_top">
<input type='hidden' name='business' value='<?=$paypalData['paypal_email'];?>'>
<input type='hidden' name='item_name' value='Booking'>
<input type='hidden' name='item_number' value='12345'>
<input type='hidden' name='user_id' value='<?=$userid;?>'>
<input type="hidden" name='amount' id="depositAmountform" value="">
<input type='hidden' name='no_shipping' value='1'>
<input type='hidden' name='currency_code' value='USD'>
<input type='hidden' name='notify_url' value='<?=$notifyURL;?>'>
<input type='hidden' name='cancel_return' value='<?=$cancelReturnURL;?>'>
<input type='hidden' name='return' value='<?=$successReturnURL;?>'>
<input type="hidden" name="cmd" value="_xclick">
<button type="submit" name=" " id="pay_now">PayPal</button>
</form>