IPTV Billing Panel Development -- 2

I'm looking for an experienced developer to create an IPTV billing panel akin to https://fast4k.cc and https://beta.gpanel.me.

Key requirements include:
- Subscription management
- Client account management
- Payment integration (methods to be discussed)

User role management features needed:
- Admin controls
- Reseller access
- End-user access

Ideal Skills & Experience:
- Strong background in developing billing panels
- Experience with user role management
- Familiarity with IPTV systems

Please provide examples of similar work done.