Easy Digital Downloads - Add an "IP Address" column to the exported .csv file at Downloads -> Reports -> Export -> Export Payment History

gistfile1.php

<?php

/**
 * Add a new column for the customer's IP Address
 */
function sumobi_edd_export_payments_csv_cols( $cols ) {
	$cols['ip_address'] = 'IP Address';

	return $cols;
}
add_filter( 'edd_export_csv_cols_payments', 'sumobi_edd_export_payments_csv_cols' );

/**
 * Add the customer's IP Address to the IP Address csv column 
 */
function sumobi_edd_export_get_data_payments( $data ) {
	foreach ( $data as $key => $d ) {
		$data[$key]['ip_address'] = edd_get_payment_user_ip( $data[$key]['id'] );
	}

	return $data;
}
add_filter( 'edd_export_get_data_payments', 'sumobi_edd_export_get_data_payments' );

How do you get the custom phone number from your guide to appear in the exported .csv ?
https://gist.github.com/sumobi/9455978

In line 18, you could alternatively use the edd_get_payment_meta() function and write:
$data[$key]['ip_address'] = edd_get_payment_meta( $data[$key]['id'], '_edd_payment_user_ip', true );
which basically does the same thing as edd_get_payment_user_ip()

I've tried appending a export column to sumobi_edd_export_payments_csv_cols at line 8
$columns['phone'] = 'Phone';
and at line 18 appending the following
$data[$key]['phone'] = edd_get_payment_meta( $data[$key]['id'], '_edd_user_phone', true );
This however seems to return an empty value to the generated csv file.

That's correct, that would work also.

The phone number is stored in the _edd_payment_meta meta_key array so you will need to access that first. You can use EDD's edd_get_payment_meta() function for this. Then you can pull out the phone number.

Thank you so much for your feedback! I've been working on this problem for the last 4 days and thanks to you I finally got it!

i.e at line 18 append:
$meta = edd_get_payment_meta( $data[$key]['id'], '_edd_payment_meta', true );
$data[$key]['phone']=$meta['phone'];

No problem :)