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What pattern(s) would be good to manage multiple API’s?
A scenario for using multiple API’s would be a payment portal that allows clients to use different payment vendors to post transactions. So this system may need to utilize a papypal, fasttransact, x, y, or z API.
You’ll want a unique Facade interface of your design, bridging your calls to each of these different payment vendors’ systems; the concrete realizations of that Facade will likely be implemented, of course, by what amounts to a collection of Adapters — and the appropriate one for a given transaction can be chosen by some appropriate Factory (method or otherwise;-).