> For the complete documentation index, see [llms.txt](https://docs.blueseasx.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.blueseasx.com/server-bidding/server-integration/bidrequest-object/user-object.md).

# User Object

<table data-header-hidden data-search="false"><thead><tr><th></th><th></th><th></th><th></th></tr></thead><tbody><tr><td><strong>Attribute</strong></td><td><strong>Type</strong></td><td><strong>Description</strong></td><td><strong>Required</strong></td></tr><tr><td>id</td><td>string</td><td>Supply-specific ID for the user. </td><td>yes</td></tr><tr><td>buyeruid</td><td>string</td><td>Buyer-specific ID for the user as mapped by supply. At least one of buyeruid or id is recommended.</td><td>no</td></tr><tr><td>yob</td><td>integer</td><td>Year of birth as a 4-digit integer.</td><td>strongly recommend</td></tr><tr><td>gender</td><td>string</td><td>Gender, where “M” = male, “F” = female, “O” = known to be other (i.e., omitted is unknown).</td><td>strongly recommend</td></tr><tr><td>ext</td><td>object</td><td>Placeholder for exchange-specific extensions to OpenRTB.</td><td>no</td></tr><tr><td>ext.consent</td><td>string</td><td>Consent String</td><td>yes for the subjected users</td></tr></tbody></table>