Canadian payments company Nuvei may not be as big as its competitors FIS, Global Payments, or Worldpay, but it is carving out a niche in the industry by finding solutions for smaller companies in tougher situations.

Nuvei has described its business to investors as “messy payments,” which includes working with gambling companies, digital retailers in Latin America, or European online stores that need specialized payment options.

That kind of niche payments business attracted the attention of private equity sponsor Advent, which is taking the business private in a deal valued at $6.3bn.