Yeah well this workaround does not take into account any amendments. You have this preview feature available in the front-end which seems to work perfectly, why on earth would you not wrap this in a simple API ? We have a very simple use case which is to have a subscription settings page which shows the user what the date and amount will be of their next payment. Because this Preview API of an existing subscription is not available, we made ourselves crazy trying to get all the information into the current Preview Subscription which was not designed for this at all and which cannot support all cases.
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