Add columns to Gift Aid export

functions.php

add_filter(
	'charitable_giftaid_export_row',
	function( $row ) {
		return array(
			'donation_id'     => $row['donation_id'] ?? '',
			'title'           => $row['title'] ?? '',
			'first_name'      => $row['first_name'] ?? '',
			'last_name'       => $row['last_name'] ?? '',
			'house_number'    => $row['house_number'] ?? '',
			'postcode'        => $row['postcode'] ?? '',
			'agg_donations'   => '',
			'sponsored_event' => '',
			'date'            => $row['date'] ?? '',
			'amount'          => $row['amount'] ?? '',
			'status'          => $row['status'] ?? '',
		);
	}
);

add_filter(
	'charitable_giftaid_export_entries_columns',
	function() {
		return array(
			'donation_id'     => __( 'Donation ID', 'charitable-gift-aid' ),
			'title'           => __( 'Title', 'charitable-gift-aid' ),
			'first_name'      => __( 'First name', 'charitable-gift-aid' ),
			'last_name'       => __( 'Last name', 'charitable-gift-aid' ),
			'house_number'    => __( 'House name or number', 'charitable-gift-aid' ),
			'postcode'        => __( 'Postcode', 'charitable-gift-aid' ),
			'agg_donations'   => 'Aggregated donations',
			'sponsored_event' => 'Sponsored event',
			'date'            => __( 'Donation date', 'charitable-gift-aid' ),
			'amount'          => __( 'Amount', 'charitable-gift-aid' ),
			'status'          => __( 'Status', 'charitable-gift-aid' ),
		);
	}
);