Scope

I cannot remove the Free Trial for certain plans

Summary

A free trial can be removed for an existing plan by editing the plan and setting the 'free trial' field as empty (not zero). You will be able to edit the plan when subscriptions are associated but the changes will not be applicable for existing subscriptions and will only be applicable for new subscriptions. 

If you want to edit this for the existing subscriptions then the only option is to create a new plan and move the existing subscriptions to that plan or you can remove all the subscriptions associated with this plan and then make changes to the plan.

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