> For the complete documentation index, see [llms.txt](https://docs.sentiance.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.sentiance.com/sdk/api-reference/ios/user-creation-and-linking/user-linking/metauserlinker.md).

# SENTUserLinker

Implement this to handle the linking of your app user to a Sentiance user, during user creation.

For details on how to link users, see [here.](/getting-started/sdk-integration/4.-user-creation.md)

<table data-header-hidden><thead><tr><th width="265.64770240700216">Parameter</th><th>Description</th></tr></thead><tbody><tr><td>installId</td><td>A unique Sentiance id representing the current installation.</td></tr><tr><td>linkSuccess()</td><td>Pass this closure which will be called if linking succeeded on the Sentiance backend.</td></tr><tr><td>linkFailure()</td><td>This closure will be called if linking failed.</td></tr></tbody></table>