post
https://api.sandbox.cleeng.com/3.1/subscription_switches
This endpoint is used to upgrade or downgrade a subscription to another subscription plan. Use either subscriptionId OR customerId and fromOfferId together (customerId and fromOfferId can only be used with Cleeng-managed subscriptions where the whole lifecycle is under the control of Cleeng). As these last two parameters are deprecated, subscriptionId is going to be the only option to use this endpoint.
Important
Subscription upgrade and downgrade feature requires compatibility of the payment connector and payment gateway. Currently the feature is fully supported for the following: Adyen, PayPal. Please contact Cleeng Support Team if you wish to use other payment connectors/gateways.