You can send the !help command to the Phantom discord bot, and it will return all key details for the key(s) you have bound to your discord.
Go to the settings tab within Phantom (gear icon in the top right corner).
Under Subscription Management within the settings tab, you will be able to see when your key expires. If you your key expires within the 6 months from the current date, then your key is renewal. (Note: Most keys are renewal, lifetime keys are very hard to come by.) If you purchased on or after 3/09/2019, your renewal fee is $150, otherwise your renewal is $60.