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To track unique logins into your event, you will need to use Dimensions instead of Metrics in Google Analytics API. A particular type of dimension you could use is User Scoped Custom Dimensions. Metrics essentially quantify measurements (like total events) while dimensions provide context to those (like which users caused those events). With User Scoped Custom Dimensions, you can assign a unique identifier (like an internal user id) to users when they log in. Then, when invoking the API, you can include this Custom Dimension in your request to help uniquely identify users. However, ensure that you are not violating Google Analytics Terms of Service regarding sending Personally Identifiable Information (PII).
