I get "Invalid timestamp" error.
Here it says that https://partner.element14.com/docs/Product_Search_API_REST__Description
userInfo.timestamp: Universal time, referred to as GMT and in the format of yyyy-MM-ddThh:mm:ss.zzz. e.g. 2009-02-0T15:45:40.254
What zzz does stand for? Unusually it refers to time zone. But here we have a strange number "254".
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