MD Live currently uses a service called Upgrade.chat to provide Discord subscription management right from within Discord using chat commands. We also partner with Stripe to provide credit secure card processing and subscription management features and to remain PCI compliant with your data - your payment information is never stored or used on any of our servers or anywhere within Discord.
Note: We acknowledge a desire to have subscription management features via a web portal and are working to provide that to you in addition to the current features.