Subscription fees are the cost for using and subscribing to the League platform. Subscription fee rates are set during your agreement with League, and are based on number of employees (if applicable) and allocation amounts (if applicable).
Subscription fees are billed forward, which means that the invoice line item includes the total cost of subscriptions for the entire next billing month.
Example: Your invoice generated April 2, with Billing Period = March 1 - March 31, will contain subscription fees billed forward that would cover the April 1 - April 30 billing period.
You can expect subscription fee charges to appear starting from your Activation Invoice.