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#!/usr/bin/perl
use warnings;
...

my $digest=hmac_sha256_hex("138539083512345apiKeyDEMO","apiSecretDEMO"
+);
print "Digest=$digest\n";

Digest=696e087f4b1902aa58d35e75b4600580d70a92ed68b23379373117fb3fe3064
+a