adding surcharges

<?php
	function my_em_add_price_adjustments( $EM_Event, $EM_Booking, $post_validation ){
			//Only apply surcharge if booking has passed validation and therefore can be saved to database
			//You could also do further checks here if you want to give discounts to specific events or bookings
			if( $post_validation ){

				//Ensure we have arrays assigned to booking meta, if not create them to avoid PHP warnings
				if( empty($EM_Booking->booking_meta['surcharges']) ) $EM_Booking->booking_meta['surcharges'] = array();

				//This one adds a fixed $25 surcharge and is applied before taxes
					$prix = $EM_Booking->get_price_pre_taxes();
					$pourcentage = 3;
					$fixe = 0.35;
					$amount = ($prix * ($pourcentage/100)) + $fixe;
				$EM_Booking->booking_meta['surcharges'][] = array(
						'name' => 'Frais Paypal',
						'desc' => 'Frais Paypal',
						'type' => '#', //numerical discount i.e. $10.00 off
						'amount' => $amount,
						'tax' => 'pre' //discount applied BEFORE taxes have been added, and IS taxable
				);
			}
		}
add_action('em_booking_add', 'my_em_add_price_adjustments', 10, 3);
?>