Application programming interface key
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An application programming interface key (API key) is a unique string of alphanumeric characters transmitted as part of an API request that authenticate the source of the API request. API keys can be of two types: Public API key and Private API key.
The API key often acts as both a unique identifier and a secret token for authentication, and will generally have a set of access rights on the API associated with it.
API keys can be based on the universally unique identifier (UUID) system to ensure they will be unique to each user.
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