How is this service implemented for customers in Nigeria? I want to know all the details so I don't get into a stupid story about sports betting in this country. Help me understand how to start betting there.

As far as I know, people in Nigeria are quite gambling, so the state openly allows betting but has a high control over such a business. It became easier after bookmakers began to work online. Here is an example of such a site - https://mel-bet.ng You do not have to live in Nigeria to use this resource. but remember about taxes)

Be careful with the betting sites you join
Super Mario