# IdentityStore

Learn how the SDK persists the visitor session.

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Use the summary below to quickly jump to a specific topic:

- [Overview](/reference/sdk/php/api/storage/identity-store/overview): Learn how the SDK persists the visitor session.
- [getClientId](/reference/sdk/php/api/storage/identity-store/get-client-id): Learn how to provide the stored client ID.
- [getUserToken](/reference/sdk/php/api/storage/identity-store/get-user-token): Learn how to provide the stored user token.
- [saveClientId](/reference/sdk/php/api/storage/identity-store/save-client-id): Learn how to store the resolved client ID.
- [saveUserToken](/reference/sdk/php/api/storage/identity-store/save-user-token): Learn how to store the resolved user token.