Overview

Switch an existing subscription to a different plan (upgrade or downgrade). plan_id and subscription_id are required; address_id and source_id are optional. Proration, payment behavior, and the billing-cycle anchor are handled by the server. Returns the customer resource with a fresh JWT.

Example:

curl --request POST \
  --url 'https://www.pelcro.com/api/v1/sdk/subscription/change?site_id=1232' \
  --header 'Authorization: Bearer <JWT>' \
  --header 'Content-Type: application/json' \
  --data '{ "subscription_id": 4055, "plan_id": 4052 }'

Notes

• Protected — requires the customer's JWT.
• FormRequest validation failures are 400; downstream/business failures return 404 with a friendly message.