How to Hide Payment Page | Payment Form for Stripe Admin Menus

function plt_hide_payment_page_menus() {
	//Hide "Payment Page".
	remove_menu_page('payment-page');
	//Hide "Payment Page → Payment Forms".
	remove_submenu_page('payment-page', 'edit.php?post_type=pp_payment_form');
	//Hide "Payment Page → Payment Gateways".
	remove_submenu_page('payment-page', 'payment-page');
	//Hide "Payment Page → Affiliation".
	remove_submenu_page('payment-page', 'payment-page-affiliation');
	//Hide "Payment Page → Contact Us".
	remove_submenu_page('payment-page', 'payment-page-contact');
	//Hide "Payment Page → Support Forum".
	remove_submenu_page('payment-page', 'payment-page-wp-support-forum');
	//Hide "Payment Page → Upgrade".
	remove_submenu_page('payment-page', 'payment-page-pricing');
}

add_action('admin_menu', 'plt_hide_payment_page_menus', 1000000000);
Where do I put this code?