The platform deploys a proprietary one-shot identifier system (GLOBAL_SN_OEST) that generates and manages a UUID-based user identifier stored in both cookies and localStorage, with a configured expiry of 400 days. The identifier is synchronized with server-side records via a POST request to /bff-api/user-api/init_info/update_oneshot and is encoded using base64 with timestamp embedding.
This analysis describes what Shein's agreement states, permits, or reserves. It does not constitute a legal determination about enforceability. Regulatory applicability and practical outcomes may vary by jurisdiction, enforcement context, and individual circumstances. Read our methodology
The OEST system establishes a persistent cross-session user identifier stored in both cookies and localStorage with a 400-day expiry, which is operationally relevant to how user identity is maintained across sessions and to the completeness of any data deletion or opt-out request, as the identifier persists in localStorage even when cookies are cleared.
Interpretive note: Whether the OEST identifier constitutes personal information subject to deletion and opt-out rights under CCPA/CPRA depends on whether it is linked or reasonably linkable to an individual consumer, which cannot be fully determined from the client-side code alone.
Previously, Shein asked users to explicitly agree or disagree with account persistence for future logins. The updated terms remove this choice entirely. Instead of a consent decision, users now see a promotional discount offer in that location. This means users lose direct control over whether Shein maintains their login session across device visits, which affects convenience and privacy preferences around authentication persistence.
View change record →Removal of OEST (one-shot identifier) technical implementation details masks proprietary tracking identifier generation and management from user scrutiny.
View full change record →OEST identifier value changed from 'MUExQjVBNjlfNDY0N18zMEY0fDE3Nzc2NTI5ODA0MzZ8X0ZCMDhfQ0I3REMyMzI4QzBC' to 'OUVCMDQyfDE3Nzg1MjI0NDc5OTN8QzJfQTIyRF9GMjU0X0RCRTlfQjMwQkU2OTVCNThC' with expanded fetch implementation details.
View full change record →The agreement deploys a proprietary persistent identifier with a 400-day lifespan stored in both cookies and localStorage, synchronized to Shein's servers. Under the current SDK configuration, cookie clearing events would remove the cookie-based copy of this identifier but not the localStorage copy (F = 400*24*60*60*1e3), meaning the identifier may persist after a consent change or cookie opt-out event.
How other platforms handle this
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"window.GLOBAL_SN_OEST.init({ ssrOest: "OUVCMDQyfDE3Nzg1MjI0NDc5OTN8QzJfQTIyRF9GMjU0X0RCRTlfQjMwQkU2OTVCNThC", shouldSetCC: true, useCC:true, i18nKey: "Curve + Plus" }); ... key:updateOest ... fetch(r,{method:"POST",headers:i}).thenExcerpt from Shein's Terms and Conditions
1) REGULATORY LANDSCAPE: Persistent user identifier systems engage CCPA and CPRA definitions of personal information (unique identifiers, device identifiers) and corresponding deletion and opt-out rights.
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The OEST system establishes a persistent cross-session user identifier stored in both cookies and localStorage with a 400-day expiry, which is operationally relevant to how user identity is maintained across sessions and to the completeness of any data deletion or opt-out request, as the identifier persists in localStorage even when cookies are cleared.
The agreement deploys a proprietary persistent identifier with a 400-day lifespan stored in both cookies and localStorage, synchronized to Shein's servers. Under the current SDK configuration, cookie clearing events would remove the cookie-based copy of this identifier but not the localStorage copy (F = 400*24*60*60*1e3), meaning the identifier may persist after a consent change or cookie opt-out event.
ConductAtlas has identified this type of provision across 290 platforms. See the full comparison.
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