Combine 2 function for em_gateway_paypal_get_paypal_vars hook

Hello,

I am using the following function to add custom form field ( Additional Vehicle Pass) for charging extra $15 for every Vehiche pass.

`function my_em_add_donation($paypal_vars, $EM_Booking, $EM_Gateway_Paypal){
$amount = $EM_Booking->booking_meta[‘booking’][‘vehicle_pass’];
$amount = ($amount * 15);
if ( !empty($amount) ){
$itemcount = 1;
$itemcount = (count($EM_Booking->get_tickets_bookings()->tickets_bookings) + 1);
$paypal_vars[‘item_name_’.$itemcount] = wp_kses_data(“Additional Vehicle Pass”);
$paypal_vars[‘quantity_’.$itemcount] = $amount / 15;
$paypal_vars[‘amount_’.$itemcount] = 15 ;
}

return $paypal_vars;
}
add_filter(’em_gateway_paypal_get_paypal_vars’,’my_em_add_donation’,1,3);

Now i want to use same function for another filed called “Shower Charge”, which field id is, shower_pass but i cant do marge 2 function there. Anyone help me plz.

https://wordpress.org/plugins/events-manager/