Disable coupon feature

<?php

function remove_coupon_manager(){
    remove_submenu_page( 'edit.php?post_type=event', 'events-manager-coupons', 100 );
}
add_action( 'admin_menu', 'remove_coupon_manager', 100 );

function remove_booking(){
    remove_action('em_events_admin_bookings_footer',array('EM_Coupons', 'admin_meta_box'),20,1);
    remove_action('em_events_admin_bookings_footer',array('EM_Coupons', 'em_cart_footer'),20,1);
    remove_action('em_booking_form_footer',array('EM_Coupons', 'em_booking_form_footer'),20,1);
}
add_action('init','remove_booking',100);