I was messing with this too. Couple questions/considerations.

/products has no signature/request requirements. It responds with full data successfully with a bare GET.

Their spec says two things about dates. All timestamp are returned in ISO8601 format in UTC with fields ending in postfix _at. Example: "created_at": "2015-07-01T00:55:47Z" but also The CB-ACCESS-TIMESTAMP header MUST be number of seconds since Unix Epoch. When I change your code to try /user instead of /products this is the response– 

{"message":"invalid timestamp"}

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In reply to Re^2: Coinbase API by Your Mother
in thread Coinbase API by ownlifeful

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