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my $str = "hello"; # no special chars, 1-127
my $sha256 = Digest::SHA::sha256("abc123"); # bytes 0-255
...
$ua->POST("aurl" ... $buffer ... $HTTPheader ...);
$ua->GET("aurl" ... $buffer ... $HTTPheader ...);
$ua->GET("aurl" ... $unicode_string ... $HTTPheader ...);

    postdata = urllib.parse.urlencode(data)
    encoded = (str(data['nonce']) + postdata).encode()
    message = urlpath.encode() + hashlib.sha256(encoded).digest()

my $postdata = Encode::encode('UTF-8', "x=1&y=2&z=greektext"); # for e
+xample, 
my $p1 = "$nonsense".'&'.$postdata; # yes & needed
...
  . $api_sha256; #<< last one is binary

# ... and post after some more massaging