About payment plugin

I notice that

1. there are already 27 payment plugins come with your package
2. from time to time, people ask for a plugin for their own situation
3. you have a developer-documentation provided for diy - www.hikashop.com/en/support/documentatio...r-documentation.html
4. message about paid-service on it goes private

My question

1. Is there any plan to enrich that list of 27? Or, that is freezed?
2. Is it all the same for Starter, Essential & Business?
3. For paid-service, what kind of budget it is about?

Thank you for your clarification.

Savio