If you are considering changing the price of your subscription product on the web, note that this will only impact customers who subscribe via the web platform.
Price increases, in any plan (monthly or yearly) or currency, cannot be applied to existing customers. The price increase will only modify the price for new subscribers.
Price decreases, however, can be applied to existing subscribers if you wish.
Once you decrease prices in any plan or currency, you will see a modal prompting as to whether or not you'd like to apply these changes to existing subscribers:

If you select Cancel, existing subscribers will continue paying the same amount while new customers will be charged the decreased amount.
If you select Apply, the impacted customers will start paying the lower price on their next renewal.
⚠️Note: Price reductions will not immediately take effect for existing users who are on active promos. Their rate will remain the same until the promotional period expires and then renew to the reduced rate if you applied it to existing customers.