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message = 'BITSTAMP ' + api_key + \ 'POST' + \ ... timestamp + \ 'v2' + \ payload_string
my $msg = $apiKey.'POST'.$urlcb.$urlpath.$ContentType.$nonce.$timestam +p.$API_Version.$Query, $apiSecret; print "Computing signature over [$msg]\n"; my $signature = hmac_sha256_hex($msg, $apiSecret);