The FAS ID is a centralized login system that GSA has been rolling out to allow you to connect to many of their websites with a single username and password. This is part of a bigger IT modernization effort to overhaul GSA websites to improve functionality and security. The FAS ID has already been implemented on the Sales Reporting Portal, the GSA Advantage Purchase Order Portal, the GSA Vendor Portal, the Mass Mod Portal, and eBuy.
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