If a particular statute requiring a license requires payment of a fee $($not the passing of an exam or proof of a particular kind of degree$)$ and a service provider never got that license before providing that good or service:

Upon paying any back penalties and fees the statute requires, that service provider will be able to collect their fee assuming they did a good job, because the licensing statute they violated was a revenue$-$raising licensing statute which is geared to raising money for the government entity requiring the license instead of being designed to protect the public's health, safety, or welfare

That service provider will be unable to collect any fees for the service they provided because it was a regulatory licensing statute that they violated

That service provider will go to jail because they did something illegal