# Credential Source Repository

After the registration of an authenticator, you will get a Public Key Credential Source object. It contains all the credential data needed to perform user authentication and much more.

Each Credential Source is managed using the Public Key Credential Source Repository.

The library does not provide any concrete implementation. It is up to you to create it depending on your application constraints. This only constraint is that your repository class must implement the interface `Webauthn\PublicKeyCredentialSourceRepository`.

The `PublicKeyCredentialSourceRepository` interface requires the following methods to be implemented:

* `public function findOneByCredentialId(string $publicKeyCredentialId): ?PublicKeyCredentialSource;` : thie method retreive a key source object from the credential ID.
* `public function findAllForUserEntity(PublicKeyCredentialUserEntity $publicKeyCredentialUserEntity): array;`: this method lists all key sources associated to the user entity
* `public function saveCredentialSource(PublicKeyCredentialSource $publicKeyCredentialSource): void;`: this method saves the key source in your storage (files, database...)


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://webauthn-doc.spomky-labs.com/v4.5/prerequisites/credential-source-repository.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.