woothemes/woocommerce — pull request #5273 by corsonr (2014-04-04 07:40:21+00:00)
Title: Added is_paying_customer() to easily check if a user is a WC customer

Usage:

```
$customer = new WC_Customer();
$out = 'Paying customer ? ';

if( $customer->is_paying_customer( 10 ) ) {
$out .= "yes";
} else {
$out .= "no";
}

echo $out;
```