How to create a module in Bitrix?

Question

1C-Bitrix

In general, there is an idea for a paid module for bitrix crm.
But there are questions - whether it is possible physical. face - not a company to place it in their marketplace, do I need to go through some kind of certification for this and maybe there are others - non-technical stones that I don't see.

Answer 1

here it seems to have everything you need,
and more specifically

Sale of solutions in the Marketplace by individuals is not possible