What companies dont use certegy?

Certegy is a check verification service used by many retailers and businesses to reduce the risk of fraud. However, companies that may not use Certegy include smaller independent retailers, local grocery stores, and online merchants that utilize different payment processing systems or verification services. Additionally, some businesses might rely on in-house verification methods or alternative services such as TeleCheck or CheckGateway. Ultimately, the choice of service depends on the company's size, location, and specific needs.