Custom rate

functions.php

add_action( 'abrs_setup_room_rate', function ( $room_rate ) {
	/* @var $room_rate \AweBooking\Availability\Room_Rate */
	$request = $room_rate->get_request();

	$request_adults = $request
		->get_guest_counts()
		->get_adults()
		->get_count();

	if ( ( $extra_adults = $request_adults - 1 ) > 0 ) {
		$custom_rate = new \AweBooking\Model\Pricing\Custom_Rate_Interval( 'extra-adult-rate', 15 * $extra_adults );
		$room_rate->additional( $custom_rate );
	}
});