plugin creation for Perfex CRM

we need to create a custom plugin to manage subscriptions in Perfex CRM: we are creating some saas products and we would like to have a single management/billing platform for all of our saas products. we need to create a custom "plugin" for perfex CRM to do the followings: 1. create saas products records with their access levels and saas features management 2. use perfex built-in invoicing and payment mamanagement 3. sync saas products users with perfex clients 4. manage saas client subcriptions through API (new,upgraded,trias ....) 5. send emails with built-in perfex feature 6. distinguish saas CLients vs normal clients in client screen in perfex quick FAQ: there's a builtin feature in perfex for subscriptions, why not to use it ? -> it needs to sync with stripe and its not available for our country. what is perfex CRM? -> please pass your way, this project is not for you. what is saas ? -> please pass your way, this project is not for you. You need to have experience of working with Perfex CRM - so start your bid with "perfex"