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There are two ways we support authentication: via Touchstone (Shibboleth), or via application certificate.  Note that some APIs do not (yet) support application certificate; this will be noted below. 

If the end user is present when

There are a Assuming that the client does not want to do Shibboleth delegated credentials

Roles and Authorization

External Data Feeds

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Intended Use Cases

Pitfalls

Does not support application certificates

Full Documentation link

Forum API

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Intended Use Cases

Pitfalls

Does not support application certificates

Full Documentation link