public function admin_notice() {

		if ( empty( $_GET['qr_checked_in'] ) ) {
			return;
		}

		// Use Human-readable ID Where Available for QR Check in Message.
		$ticket_id        = absint( $_GET['qr_checked_in'] );
		$no_match         = isset( $_GET['no_security_code_match'] ) ? absint( $_GET['no_security_code_match'] ) : false;
		$ticket_status    = get_post_status( $ticket_id );
		$checked_status   = get_post_meta( $ticket_id, '_tribe_qr_status', true );
		$ticket_unique_id = get_post_meta( $ticket_id, '_unique_id', true );
		$ticket_id        = $ticket_unique_id === '' ? $ticket_id : $ticket_unique_id;

		// If the attendee was deleted.
		if ( false === $ticket_status || 'trash' === $ticket_status ) {

			echo '<div class="error"><p>';
				printf( esc_html__( 'The ticket with ID %s was deleted and cannot be checked-in.', 'event-tickets-plus' ), esc_html( $ticket_id ) );
			echo '</p></div>';

		// If Security Code does not match
		} elseif ( $no_match ) {
			echo '<div class="error"><p>';
				printf( esc_html__( 'The security code for ticket with ID %s does not match.', 'event-tickets-plus' ), esc_html( $ticket_id ) );
			echo '</p></div>';

		// If status is QR then display already checked-in warning.
		} elseif ( $checked_status ) {

			echo '<div class="error"><p>';
				printf( esc_html__( 'The ticket with ID %s has already been checked in.', 'event-tickets-plus' ), esc_html( $ticket_id ) );
			echo '</p></div>';

		// Otherwise, just check-in like normal.
		} else {

			echo '<div class="updated"><p>';
				printf( esc_html__( 'The ticket with ID %s was checked in.', 'event-tickets-plus' ), esc_html( $ticket_id ) );
			echo '</p></div>';

			// Update the checked-in status when using the QR code here.
			update_post_meta( absint( $_GET['qr_checked_in'] ), '_tribe_qr_status', 1 );
		}
	}