I have fixed all compilation error now. There are the tokens and other base urls reading from the config.properties. Please suggest if anything wrong.

#!/usr/bin/env perl
package Op;
use strict;
use warnings;
use Win32::Process;
use REST::Client;
use JSON::Parse ':all';
use MIME::Base64;
use Term::ReadKey;
use Data::Dumper;
use MIME::Lite;
use Net::SMTP;
use Spreadsheet::XLSX;
use Spreadsheet::ParseXLSX;
use Excel::Writer::XLSX;
use Config::Properties;
use Data::Dumper;
use List::Compare;
use Array::Compare;
use Storable qw/freeze/;
use Data::Validate::IP;
use Data::Table::Excel;
use Excel::Writer::XLSX::Chart;
use Win32::OLE::Const; 
use Spreadsheet::WriteExcel::Utility qw( xl_range_formula );
use Win32::OLE;
use POSIX 'strftime';
use POSIX qw(strftime);
use DateTime;
use DateTime::Format::Strptime;
use Try::Tiny;
use feature qw{ say };

open my $fh, '<', "C:/PERL/" . "config.properties" or die "unable to o
+pen configuration file";
my $properties = Config::Properties->new();
$properties->load($fh);
my $value = $properties->getProperty('dev.token');
my $baseurl = $properties->getProperty('dev.baseURL');
my $from_address = 'chandan@aol.com';
my $to_address = 'chandan@bol.com';
my $subject = 'A message with 2 parts ...';
my $my_file_zip = 'C://PERL//';
my $mail_host = 'mail.aol.com';
my $pass = '1234567';



sub result {
    
    my ($args) = @_;
    my $appID   = $args->{APPID};
    my $datver   = $args->{datetime};
    my $email   = $args->{Email};
    my $date = strftime '%Y-%m-%d-%H-%M-%S', localtime;
    my $date3 = strftime '%Y-%m-%d' , localtime(time() - $datver*60*60
+);
    my $date4 = strftime '%Y-%m-%d' , localtime(time() - 24*60*60);
    my $apiurllog = $baseurl ."/users/sys/logs?";
    my $client = REST::Client->new();
    my @responsetext;
    my @responsetextall;
    my $sortor = "filter=eventType+eq+%22";
    my $filter = "all.auth.sso";
    my @responsalter;
    my $target = "%22+and+to.id+eq+%22";
    my $strExcelFilename;
    my %header1 = (
             -size => 10,
        );
    
    sub api_call {
  $client->addHeader('Authorization',"SSWS $value");
  $client->addHeader('Accept','application/json');
  $client->addHeader('Content-type','application/json');
  $client->GET($_[0]);
}

my $date2 = "%22&since=" . $date3 . "T00%3A00%3A00.000-04%3A00&until="
+ . $date4 . "T23%3A59%3A59.000-04%3A00";

my $urlstringlog = $apiurllog . $sortor . $filter . $target . $appID .
+ $date2;

$strExcelFilename = "C:/PERL/" . "My-File" . $date . ".xlsx";

my $your_file_zip = "My-File . $date . '.xlsx'";

run_api_call($urlstringlog);
@responsetext = parse_json ($client->responseContent());
push @responsetextall, @responsetext;

for my $i (0..$#responsetextall) {

for my $j (0..$#{$responsetextall[$i]}) {

 my $responseid = $responsetextall[$i][$j]{act}{UID};
 my $responsdisp = $responsetextall[$i][$j]{act}{Name};

push @responsalter,  $responseid ;
}

}

my $workbook  = Excel::Writer::XLSX->new( $strExcelFilename );
my $format_bold = $workbook->add_format( bold => 1, size => 10, top=> 
+1, bottom=> 1 ); 
        my $format2 = $workbook->add_format(%header1);
my $worksheet = $workbook->add_worksheet('UserSSO-Data');

my $r = 1;
my $r2 = 1;
my $r3 = 1;

 foreach my $j (0..$#responsalter ) {
            
                                $worksheet->write(0, 0, 'UserSSO-Total
+-Users' );
                                
            $worksheet->write($r2, 0, $responsalter[$j]);
            
        
            $r2 += 1;
        }
        
        
        
        $workbook->close;
print "Spreadsheet saved.\n";

## Mail Functionality

 my $msg = MIME::Lite->new (
   From => $from_address,
   To => $to_address,
   Subject => $subject,
   Type =>'multipart/mixed'
 ) or die "Error creating multipart container: $!\n";

$msg->attach (
    Type => 'text/csv',
    Encoding => 'base64',
    Path => $my_file_zip,
    Filename => $your_file_zip,
    Disposition => 'attachment'
 ) or die "Error adding $your_file_zip: $!\n";

 MIME::Lite->send('smtp', $mail_host, Timeout=>60,Auth=>'LOGIN',AuthUs
+er=>$from_address,AuthPass=>$pass,Port => 25, Debug => 1);
 
 }
                
__PACKAGE__
[download]

I am getting below error now

Undefined subroutine &Op::run_api_call called at C:/Users/chandan/Docu
+ments/Perl/webapp/bin/../lib/Op1.pm line 86.
C:/Users/chandan/Documents/Perl/webapp/bin/../lib/Op1.pm line 86
81    
82    $strExcelFilename = "C:/PERL/" . "My-File" . $date . ".xlsx";
83    
84    my $your_file_zip = "My-File . $date . '.xlsx'";
85    
86    run_api_call($urlstringlog);
87    @responsetext = parse_json ($client->responseContent());
88    push @responsetextall, @responsetext;
89    
90    for my $i (0..$#responsetextall) {
[download]

You removed sub result. Your code doesn't contain the nested subs anymore, but now you can't run the sub you need. Was it the right solution?

Take a step back. Start from a simple thing. Add one feature at a time, always test it didn't break. If you change several things at once, you don't know exactly which one is the culprit. For example, start with an empty page. Then add a form. Once it works, add calling the rest client. Once it works, add the spreadsheet. It's not a weakness to progress in small steps, it's a method that one needs to learn. You'll see it leads to the results faster than trying to write everything at once, in the end.

map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

Sir, Please check my existing code, Yes, I am trying to do what you have explained, Can you please let me know how i can utlize my nested sub for calling my api?

#!/usr/bin/env perl
package Op;
use strict;
use warnings;
use Win32::Process;
##use Net::LDAP;
use REST::Client;
use JSON::Parse ':all';
use MIME::Base64;
use Term::ReadKey;
use Data::Dumper;
use MIME::Lite;
use Net::SMTP;
use Spreadsheet::XLSX;
use Spreadsheet::ParseXLSX;
use Excel::Writer::XLSX;
use Config::Properties;
use Data::Dumper;
use List::Compare;
use Array::Compare;
use Storable qw/freeze/;
use Data::Validate::IP;
use Data::Table::Excel;
use Excel::Writer::XLSX::Chart;
use Win32::OLE::Const; 
use Spreadsheet::WriteExcel::Utility qw( xl_range_formula );
use Win32::OLE;
use POSIX 'strftime';
use POSIX qw(strftime);
use DateTime;
use DateTime::Format::Strptime;
use Try::Tiny;
use feature qw{ say };

open my $fh, '<', "C:/PERL/" . "config.properties" or die "unable to o
+pen configuration file";
my $properties = Config::Properties->new();
$properties->load($fh);
my $value = $properties->getProperty('oktapreview.token');
my $baseurl = $properties->getProperty('oktaQA.baseURL');
my $from_address = 'chandan@aol.com';
my $to_address = 'chandan@bol.com';
my $subject = 'A message with 2 parts ...';
my $my_file_zip = 'C://PERL//';
my $mail_host = 'mail.aol.com';
my $pass = '1234567';



sub result {
    
    my ($args) = @_;
    my $appID   = $args->{APPID};
    my $datver   = $args->{datetime};
    my $email   = $args->{Email};
    my $date = strftime '%Y-%m-%d-%H-%M-%S', localtime;
    my $date3 = strftime '%Y-%m-%d' , localtime(time() - $datver*60*60
+);
    my $date4 = strftime '%Y-%m-%d' , localtime(time() - 24*60*60);
    my $apiurllog = $baseurl ."/users/sys/logs?";
    my $client = REST::Client->new();
    my @responsetext;
    my @responsetextall;
    my $sortor = "filter=eventType+eq+%22";
    my $filter = "all.auth.sso";
    my @responsalter;
    my $target = "%22+and+to.id+eq+%22";
    my $strExcelFilename;
    my %header1 = (
             -size => 10,
        );
    
    sub api_call {
  $client->addHeader('Authorization',"SSWS $value");
  $client->addHeader('Accept','application/json');
  $client->addHeader('Content-type','application/json');
  $client->GET($_[0]);
}

my $date2 = "%22&since=" . $date3 . "T00%3A00%3A00.000-04%3A00&until="
+ . $date4 . "T23%3A59%3A59.000-04%3A00";

my $urlstringlog = $apiurllog . $sortor . $filter . $target . $appID .
+ $date2;

$strExcelFilename = "C:/PERL/" . "My-File" . $date . ".xlsx";

my $your_file_zip = "My-File . $date . '.xlsx'";

api_call($urlstringlog);
@responsetext = parse_json ($client->responseContent());
push @responsetextall, @responsetext;

for my $i (0..$#responsetextall) {

for my $j (0..$#{$responsetextall[$i]}) {

 my $responseid = $responsetextall[$i][$j]{act}{UID};
 my $responsdisp = $responsetextall[$i][$j]{act}{Name};

push @responsalter,  $responseid ;
}

}

my $workbook  = Excel::Writer::XLSX->new( $strExcelFilename );
my $format_bold = $workbook->add_format( bold => 1, size => 10, top=> 
+1, bottom=> 1 ); 
        my $format2 = $workbook->add_format(%header1);
my $worksheet = $workbook->add_worksheet('UserSSO-Data');

my $r = 1;
my $r2 = 1;
my $r3 = 1;

 foreach my $j (0..$#responsalter ) {
            
                                $worksheet->write(0, 0, 'UserSSO-Total
+-Users' );
                                
            $worksheet->write($r2, 0, $responsalter[$j]);
            
        
            $r2 += 1;
        }
        
        
        
        $workbook->close;
print "Spreadsheet saved.\n";

## Mail Functionality

 my $msg = MIME::Lite->new (
   From => $from_address,
   To => $to_address,
   Subject => $subject,
   Type =>'multipart/mixed'
 ) or die "Error creating multipart container: $!\n";

$msg->attach (
    Type => 'text/csv',
    Encoding => 'base64',
    Path => $my_file_zip,
    Filename => $your_file_zip,
    Disposition => 'attachment'
 ) or die "Error adding $your_file_zip: $!\n";

 MIME::Lite->send('smtp', $mail_host, Timeout=>60,Auth=>'LOGIN',AuthUs
+er=>$from_address,AuthPass=>$pass,Port => 25, Debug => 1);
 
                 }
[download]