includes/lib/stripe-php/lib/Service/PlanService.php

Method: Returns a list of your plans.

Method: You can now model subscriptions more flexibly using the Prices API. It replaces the Plans API and is backwards compatible to simplify your migration.

Method: Deleting plans means new subscribers can’t be added. Existing subscribers aren’t affected.

Method: Retrieves the plan with the given ID.

Method: Updates the specified plan by setting the values of the parameters passed. Any parameters not provided are left unchanged. By design, you cannot change a plan’s ID, amount, currency, or billing cycle.