What happens when a trial subscription changes plans?

If a subscription change changes the underlying plan and the new plan has a different trial rule, the original plan's trial rules will hold. This is true for both immediate and at renewal changes.

Example: 7-Day Trial to No Trial
If a subscription currently in a 7-day trial changes it's plan to one without a trial, the subscription will stay in the current 7-day trial, but now have access to the new plan. For example, if the customer is 4 days into the trial and changes their plan, they will get the new plan free for 3 days.

Example: No Trial to 7-Day Trial
If a subscription is currently not in a trial and changes it's plan to one with a 7-day trial, the subscription will not receive a trial and will be charged for the new plan.

Example: 7-Day Trial to 14-Day Trial
if a subscription currently in a 7-day trial changes it's plan to one with a 14-day trial, the subscription will stay in the current 7-day trial, but now with access to the new plan. For example, if the customer is 4 days into the trial and changes their plan, they will only get a 3-day trial of the new plan that normally has a 14-day trial.