WooCommerce - is user a paying customer?

gistfile1.php

<?php

	/**
	 * Is the user a paying customer?
	 *
	 * @access public
	 * @return bool
	 */
	function is_paying_customer( $user_id ) {
	
	     $paying_customer = get_user_meta( $user_id, 'paying_customer', true );  
		 if( $paying_customer != '' && absint( $paying_customer ) > 0) {
			 return true;
		 }
	     
	     return false;
	}