About the Licenses, subscriptions, prices, payments category

Licenses, subscriptions, account, purchases, payments, updates, renewals - all billing questions

I can´t understand about the period of paymente. I bought a Lite License, but i need a Standard, if fact. To upgrade, says “Missing AES encryption, Amazon S3, Azure Storage & OneDrive for Business, $89 one time fee”. What means “one time fee” ? I’ll by charger one time a year ? Or never more ? or monthly (in this case, will be too expensive for me) ?