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// Add your own function to add the fields
add_filter( 'wpdonations_donation_data_fields', 'admin_add_fields' );

// Add new fields to the edit donation screen in the administration
function admin_add_fields( $fields ) {
	$fields['_donor_phone'] = array(
		'label' 		=> __( 'Phone', 'wpdonations' ),
		'type' 			=> 'text',
		'placeholder' 	=> '',
		'description' 	=> ''
	);
	return $fields;
}