b63f17b5f1
- Add help for 'payment account' field in the enrol instance form - Remove MOODLE_INTERNALs when not necessary - Add $userid to deliver_order - Check if provider classes implement the provider interface - Rename get_cost to get_payable - get_payable returns payable object - Improve registerEventListeners and added init - Rename payment\provider to payment\service_provider