Capture default user profile fields at Membership Checkout using Register Helper

my_default_wp_user_checkout_fields.php

/*
	Add Website and Biographical Info to Membership Checkout
*/
function my_default_wp_user_checkout_fields()
{
	if(class_exists("PMProRH_Field"))
	{
		pmprorh_add_checkout_box("additional", "Additional Information");
		$fields = array();
	
		//user_url field
		$fields[] = new PMProRH_Field(
			"url", 
			"text", 
			array(
				"label"=>"Website",
				"size"=>40,
				"profile"=>true,
				"required"=>false,
			)
		);

		//user_description field
		$fields[] = new PMProRH_Field(
			"description", 
			"textarea", 
			array(
				"label"=>"Biographical Info",
				"size"=>40,
				"profile"=>true,
				"required"=>false,
			)
		);

		foreach($fields as $field)
			pmprorh_add_registration_field("additional", $field);	
		}
}
add_action("init", "my_default_wp_user_checkout_fields");

For a version that submits the url to wp_user table at checkout:
https://gist.github.com/ipokkel/2f88849447f85175eb161b19d4551119