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This strategy will prorate based on remaining days of a fixed month length of 30.
This means that prorating done on the 5th of any month will result in the same outcome.

This strategy calculates actual remaining days of the month (including the date itself) but uses a
30-day month length as divisor regardless of actual month length.

Example 1: January 5th would be calculated by bundleValue * (27/30).

Example 2: February 5th would be calculated by bundleValue * (24/30).

This strategy will prorate a bundle based on the actual remaining days of the month (including the date itself), using the calendar month length.
This implies that the prorated result will differ for the same day of month, in different months.

Example 1: February 27, 2018 would be bundleValue * (2 / 28).

Example 2: February 27, 2016 (leap year) would be bundleValue * (3 / 29).

Example 3: January 10, 2018 would be bundleValue * (22 / 31).

This strategy will prorate a bundle based on the remaining days of the current invoice schedule, compared to the associated billing cycle length.
The calculation is bundleValue * ( remainingDays / billing_cycle.length ).

Let the billing_cycle have a length of 14 and the current invoice_schedule be from 1st-14th January.
Let the date the bundle is activated be the 8th of January.

The prorated value will be bundleValue * ( 7 / 14 ).