The `getProviderKey` method in the `TokenInterface` of the PHP Symfony component security core authentication token is used to retrieve the unique identifier of the authentication provider that issued the token.
In Symfony's security system, an authentication provider is responsible for authenticating a user based on their credentials. The provider key is a string identifier assigned to each authentication provider configured in the system.
By calling the `getProviderKey` method on a token object, you can retrieve the provider key of the authentication provider that generated the token. This information can be useful for various tasks, such as determining the source of the authentication token or performing specific actions based on the provider key.
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