PHP-intercom not working after updating composer - php

Question

i recently updated using composer. After updating I am getting error in php file , where I am sending data to intercom. This is the error :
Fatal error: Class 'Intercom\IntercomBasicAuthClient' not found in <filename>
I found a similar problem here Symfony Exception (Class not found) only on development and production servers. But couldn't understand exactly how to solve the issue.
I tried using intercom in Uppercase as well as lowercase, but problem is not solved.
In my installed.json I found this :
"autoload": {
"psr-4": {
"Intercom\\": [
"src"
]
}
}
And this is the directory location of intercom files :
/public_html/vendor/intercom/intercom-php/src
When I dig into more composers file(was trying to understand how classes are included and all), I came across this code in autoload_namespaces.json
<?php
// autoload_namespaces.php #generated by Composer
$vendorDir = dirname(dirname(__FILE__));
$baseDir = dirname($vendorDir);
return array(
'libphonenumber' => array($vendorDir . '/giggsey/libphonenumber-for-php/src'),
'PhpAmqpLib' => array($vendorDir . '/php-amqplib/php-amqplib'),
);
libphonenumber and phpamqplib are two libraries that I installed using composer, and intercom is missing here.
So I am totally confused, what is the actual problem.
Is the intercom library missing in autoload_namespace or is it the uppercase-lowercase issue or what.
Edit :
This I found in autoload_psr4.php
<?php
// autoload_psr4.php #generated by Composer
$vendorDir = dirname(dirname(__FILE__));
$baseDir = dirname($vendorDir);
return array(
'Psr\\Http\\Message\\' => array($vendorDir . '/psr/http-message/src'),
'JmesPath\\' => array($vendorDir . '/mtdowling/jmespath.php/src'),
'Intercom\\' => array($vendorDir . '/intercom/intercom-php/src'),
'GuzzleHttp\\Psr7\\' => array($vendorDir . '/guzzlehttp/psr7/src'),
'GuzzleHttp\\Promise\\' => array($vendorDir . '/guzzlehttp/promises/src'),
'GuzzleHttp\\' => array($vendorDir . '/guzzlehttp/guzzle/src'),
'Aws\\' => array($vendorDir . '/aws/aws-sdk-php/src'),
);
And this is how I am including Intercom in my php file :
use Intercom\IntercomBasicAuthClient;

Answer 1

I figured it out myself.
The problem was with PHP version. I am using php-5.5 and the intercom library strictly requires PHP version >= 5.6 .
Created my own library using Intercom APIs to get it work for php-5.5.