Want Customization for 6valley Multi-Vendor E-commerce {Codecanyon Product}

I have Purchased the Codecanyon Product - 6valley Multi-Vendor E-commerce (https://codecanyon.net/item/6valley-multivendor-ecommerce-complete-ecommerce-mobile-app-web-and-admin-panel/31448597)

I want to add some features to it.

1. WhatsApp Notification for Orders Updates. (Can use MSG91 WhatsApp API as the product already have MSG91 for SMS)

2. OTP verification at Login page

3. Shiprocket Implementation (Not mandatory)

Please give the Cost for Each Customization