This is an extension chips developed by a beginner in php

First, all requests doesn’t work because the creator don’t use $wpdb->prefix to select field.

Then the request to add a company contains error :
like that :
‘phone1’ => $_POST[phone1],
‘phone1’ => $_POST[phone1],
you send twice the same value.

And the biggest error Category management! To add company you need category, but you can create category, lot of error in your file.