Generates (or retrieves) a Cognito ID. Supplying multiple logins will create an implicit linked account.
This is a public API. You do not need any credentials to call this API.
/// An exception thrown when a dependent service such as Facebook or Twitter is not responding
///
/// Thrown when the service encounters an error during processing the request.
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/// Thrown for missing or bad input parameter(s).
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/// Thrown when the total number of user pools has exceeded a preset limit.
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/// Thrown when a user is not authorized to access the requested resource.
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/// Thrown when a user tries to use a login which is already linked to another account.
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/// Thrown when the requested resource (for example, a dataset or record) does not exist.
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/// Thrown when a request is throttled.
///