You can update the Payage component using the Joomla Extensions Update page if you have a current subscription, but for this to work, you must have the Remository Update Authentication plugin installed, published and configured with your software key (see your profile when you login at https://remository.com).
You can download the Payage component from https://remository.com provided you have a suitable subscription.
By default Joomla checks for updates every six hours but you can change this by changing the Update Caching parameter in Installer Options. If you set Update Caching to zero, Joomla checks for updates every time you load the Joomla admin control panel.