I already have an active subscription and I want to upgrade. How does that work?
You will not be charged immediately. All subscription upgrades are prorated and calculated automatically.
When switching subscription types (Monthly to Yearly or Plus to Pro), your account receives the time remaining on your subscription as credit, which will go towards the cost of the upgrade. The difference will either be added to your next invoice alongside your subscription rate or given back as subscription credit during your next billing period (generally, on your subscription renewal date).
How can I check my subscription credit balance?
You can check your credit balance by going to your My Account Page and looking at the Manage Your Subscription section.