Subscription Update Charges API

There have been a few use cases of our users who wish to get the details of the payments beforehand while upgrading/downgrading a customer's subscription.
So for this, you can use the Subscription Update Charges API - The API will be fired with a POST request along with the existing subscription Id in the Request URL.
In response to this API, you will get all the details of the current plan, the new plan, their prices, the prorated amount, the remaining credits, etc.