Securing Entry Links

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HMAC

The hash-based message authentication code (hmac) value is an MD5 hmac hash of the unique_user_id and the demographic parameters from the entry link.

Exlude from hash: ["ssi3", "ssi2", "ssi", "si", "lang", "offer_id", "hmac", "fc"]

The hmac is used to verify the integrity and authenticity of a message.