Visa Inc, commonly known as Visa, is nothing more than an American multinational financial services corporation from Foster City, California. Its purpose is to facilitate electronic funds transfers worldwide, mostly by using a Visa credit/debit card and gift cards. There is not one online casino in this world which doesn't accept Visa for deposits or cash out.
In the Democratic Republic of Congo, a country with never-ending natural resources, regulations for online gambling are not clear. There are no laws in place that would forbid online gambling, and gambling in land-based casinos is allowed with a license. There is an abundance of international casino sites that offer their services to the people of Congo.