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Can I use the EIAS key to uniquely identify an eBay User?
The EIASToken is an unique identifier for an eBay User across all eBay sites. The EIAS key remains unchanged, even when a user changes their eBay UserId. The EIAS key is 64 bytes long, and is Base 64 encoded.
API Document: User.EIASToken
Retrieving User Information
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