[ajhit406]

Are annual plans really that difficult to implement? Doesn't seem like it should be that difficult unless you have complex pricing behaviors. What are some of the most common stumbling blocks with transferring a plan from monthly to annual?

[math_reads]

Yearly plans are not the issue. The real problem is to work with different plan intervals: for instance, when a customer switches from a yearly plan paid in advance to a monthly plan, you need to prorate the period they used your product and issue a credit note to refund them for the rest of the period.