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Does a keyset expire? Should I go through some process to renew my keyset?
Summary
Unlike a user token, keysets do not expire. Once you generate a keyset, it is valid till you remain a member of the developers program. If you believe that your keyset is compromised, you can request us to invalidate it and generate a new keyset by filing support request ticket:
http://developer.ebay.com/support/developersupport/
Additional Info
Getting Started: Quick Start Guide video
Getting Started