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→Overview of OAuth
* authenticating API calls: the consumer uses credentials to authenticate its API calls against the data host.
=== Differences between OAuth 1.0 and 2.0 ===
Though they both follow the above pattern, OAuth 1.0 and 2.0 are incompatible at the protocol level. The important design differences arequite different:
* In OAuth 1.0, API call authentication requires both the user-specific secret and the data-consumer secret. In OAuth 2.0, only the user-specific secret is needed to authenticate API calls.