**Source URL:** https://limited.veevavault.dev/sitevault/vault-sdk/shared-code

# Shared Code

<LandingPageList>
*   [Request Context](/sitevault/vault-sdk/shared-code/request-context/)
*   [User-Defined Classes](/sitevault/vault-sdk/shared-code/udc/)
*   [User-Defined Models](/sitevault/vault-sdk/shared-code/udm/)
*   [User-Defined Services](/sitevault/vault-sdk/shared-code/uds/)
</LandingPageList>

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