Add Anonymous Donation field in GiveWP form CSV

give_anonymous_donation_export_donation_data.php

/**
* Add Anonymous Donation Data fields in export donor fields tab.
*/
function give_anonymous_donation_standard_donor_fields() {
	?>
	<li>
		<label for="give-anonymous-donations">
			<input type="checkbox" checked
			       name="give_give_donations_export_option[give_anonymous_donation]"
			       id="give_anonymous_donation"><?php _e( 'Anonymous Donation', 'give' ); ?>
		</label>
	</li>
	<?php
}

add_action( 'give_export_donation_standard_donor_fields', 'give_anonymous_donation_standard_donor_fields' );


/**
* Add Anonymous Donation header in CSV.
*/
function give_anonymous_donation_update_columns_heading( $cols ) {
	if ( isset( $cols['give_anonymous_donation'] ) ) {
		$cols['give_anonymous_donation'] = __( 'Anonymous Donation', 'give' );
	}

	return $cols;

}

add_filter( 'give_export_donation_get_columns_name', 'give_anonymous_donation_update_columns_heading' );


/**
* Add Anonymous Donatio fields in CSV.
*/
function give_anonymous_donation_export_donation_data( $data, $payment, $columns ) {
	if ( ! empty( $columns['give_anonymous_donation'] ) ) {
		$message = $payment->get_meta( '_give_anonymous_donation' );
		if ( $message == 1 ){
			$data['give_anonymous_donation'] = 'Yes';
		} else {
			$data['give_anonymous_donation'] = 'No';
		}
	}

	return $data;
}

add_filter( 'give_export_donation_data', 'give_anonymous_donation_export_donation_data', 10, 3 );