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    return $result // undef;

}

=head2 Sample Ouput success

    {"ParsedResults":[{"TextOverlay":{"Lines":[{"LineText":"Current","Words":[{"WordText":"Current","Left":11.666666030883789,"Top":59.166664123535156,"Height":14.999999046325684,"Width":54.999996185302734}],"MaxHeight":14.999999046325684,"MinTop":59...

=head2 Sample Ouput error

    {"OCRExitCode":99,"IsErroredOnProcessing":true,"ErrorMessage":["Parameter name 'attributes' is invalid. Valid parameters: apikey,url,language,isoverlayrequired,base64image,iscreatesearchablepdf,issearchablepdfhidetextlayer,filetype,addressparsing...

=cut

####################
# internal function
###################
sub _generate_request {
    my $params = ( scalar( @_ ) > 1 ) ? $_[1] : shift;

    my $request_hash = {