Custom placeholder #_BOOKINGPAYPALLINK

<?php
/*
This snippet adds an placeholder called #_BOOKINGPAYPALLINK which displays a link to PayPal for payment of a booking.

This is a standard WordPress hook function. For installation instructions of custom snippets see here - http://wp-events-plugin.com/tutorials/how-to-safely-add-php-code-to-wordpress/
*/
    add_filter('em_booking_output_placeholder','my_em_get_payment_type',1,3);
    function my_em_get_payment_type($replacement, $EM_Booking, $result){
        if (is_object($EM_Booking)) {
            if ($result == '#_BOOKINGPAYPALLINK') {
                $count = 1;
                $url_params = "https://www.paypal.com/cgi-bin/webscr?cmd=_cart&upload=1";
                $url_params .= "&business=".get_option('em_paypal_email');
                $url_params .= "&custom=".$EM_Booking->booking_id.':'.$EM_Booking->event_id;
                $url_params .= "&currency_code=".get_option('dbem_bookings_currency', 'USD');

                //For discount
                $discount = $EM_Booking->get_price_discounts_amount('pre') + $EM_Booking->get_price_discounts_amount('post');
                $url_params .= "&discount_amount_cart=".$discount;

                foreach( $EM_Booking->get_tickets_bookings()->tickets_bookings as $EM_Ticket_Booking ){
                    $price = $EM_Ticket_Booking->get_price() / $EM_Ticket_Booking->get_spaces();
                    if( $price > 0 ){
                        $url_params .= "&item_name_".$count."=".wp_kses_data($EM_Ticket_Booking->get_ticket()->name);
                        $url_params .= "&quantity_".$count."=".$EM_Ticket_Booking->get_spaces();
                        $url_params .= "&amount_".$count."=".round($price,2);
                    }
                    $count++;
                }

                $replacement = "<a href='".$url_params."'>"."Pay Here"."</a>";
            }
        }
        return $replacement;
    }