One term subscriptions via Fugawi.com purchase compared to Auto-Renew subscriptions for charts sold in iTunes App Store
Article SB1538, September 26, 2017
Apple support has a generalized article on disabling automatic renewal of any kind of subscription in your iTunes account. See: https://support.apple.com/en-us/HT202039
Fugawi.com chart purchases generally do not have an automatic renewal feature.
If you bought a chart in-app with iNavX, any disabling of auto-renewal is done through the iTunes Store.
If you bought a chart via the Fugawi.com web store, there is no automatic renewal function and so you will not be charged money for a product on the expiration date of the subscription.