HMAC validation failed due to the fbclid parameter

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Recently our application began to log HMAC validation issues. After we investigated the problem, we found that the problem is that in the input validation string there is a parameter fbclid=some_hash which cause the problem. Without this parameter, validation works fine. The question is why there is no information about this parameter in the documentation. Actually, the documentation says that we should leave the input query string without changes after removing HMAC parameter 

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solved this. the special characters were coming due to missing UTF-8 encoding while retrieving parameters from request

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