Schedules a plan variation change for all active subscriptions under a given plan variation.
POST
/v2/subscriptions/bulk-swap-plan
Schedules a plan variation change for all active subscriptions under a given plan variation.
For more information, see Swap Subscription Plan Variations.
The ID of the new subscription plan variation.
This field is required.
The ID of the plan variation whose subscriptions should be swapped. Active subscriptions using this plan variation will be subscribed to the new plan variation on their next billing day.