812f2401_rivacy___Cookies___PlumbCenter__Description_and_Purpose
[Cookie Name] ltpatoken2 [Session / Persistent] Session [First / Third Party] First Party [Description and Purpose] 
WebSphere Commerce generates the Lightweight Third Party Authentication (LTPA) cookie, where it can be used by other WebSphere Application Server applications. This enables WebSphere Commerce to be the authentication engine. In a single sign-on (SSO) scenario, an HTTP cookie is used to propagate a user's authentication information to disparate Web servers relieving the user from entering authentication information for every new client-server session (assuming basic authentication)
Security Privacy & Cookies | PlumbCenter
Description and Purpose