I've a product website comprised with subscription plan. I've two types of subscription i.e. Monthly and Yearly.
How I can charge from PayPal in case number of licenses changed by customer?
The customer comes with 5 years of subscription plan for Product and I charge yearly subscription from PayPal.
Assume, at the time of beginning;
==> Customer buys 10 licenses and per user licenses cost is 100$
==> So, I've charged yearly 1000$ through PayPal
==> Now, after four months customer wants to buy 20 licenses now. In that case, for next year of subscription can easily manage i.e. 2000$ per year
==> BUT, for current year, I need to charge 666.67$ more for 10 more licenses for 8 months.
Question: Here is, as PayPal integration with Subscription plan is yearly then what are different alternatives we have to charge 666.67$ amount?