my_pmp_add_gateway_column_to_member_export_cvs.php

<? 
/**
* This recipe will change add a Payment type column to your members Export CSV
* You can add this recipe to your site by creating a custom plugin
* or using the Code Snippets plugin available for free in the WordPress repository.
* Read this companion article for step-by-step directions on either method.
* https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
*/

// add the code below - you may add other columns similarly

function my_pmpro_members_list_csv_extra_columns($columns)
{
	$columns["Payment"] = "my_extra_column_payment";	
	return $columns;
}
add_filter("pmpro_members_list_csv_extra_columns", "my_pmpro_members_list_csv_extra_columns", 10, 2);


function my_extra_column_payment($user)
{
	$last_order = new MemberOrder();
	$last_order->getLastMemberOrder($user->ID);
	
	$gateway = '';
	
	if(!empty($last_order->gateway))
		$gateway = $last_order->gateway;
	
	return $gateway;
}