Perfex CRM Customization PHP

I'm in need of expert PHP developers to develop some features based on Perfex CRM
https://codecanyon.net/item/perfex-powerful-open-source-crm/14013737

1. Setup SAAS Multitenant based module and configure proper settings for registration of new client on their subdomains and auto setup SSL.
Module path : https://codecanyon.net/item/perfex-crm-saas-module-transform-your-perfex-crm-into-a-powerful-multitenancy-solution/46070331
[Already purchased licence]

2. Change CSS design of sidebar navigation menu, header and Kanban page redesign as per reference UI design [ Share later]

3. Integrate Zapier with Perfex CRM based on APIS & webhooks of this module.
https://codecanyon.net/item/rest-api-for-perfex-crm/25278359
- Each SAAS client will have their own seperate URL of Perfex CRM to integrate with their Zapier account.

4. Install Wordpress On Landing page of SAAS module ( in point 1 ) and connect Login/Registation/Pricing page to SAAS module registration/billing page.

5. Create automatic workflows rules feature which help to do some automatic actions based on some activities.
for example 1. Auto send an email when invoice is due, or task is overdue.
2. Send an email to manager when lead status is not change for 7 days.
I will share reference example on discussion