PayKit is a set of PHP classes to use with PayPal PayFlow Pro. Use PayKit to reduce time developing payment processing for subscription websites. Using PayFlow Pro, you don’t redirect customers to another website to enter their credit card information. Use PayKit with PayFlow Pro to maintain your branding and give your customers a high-quality experience. Still, pouring over documentation and writing custom code for PayFlow Pro can take long hours of development time. PayKit gives you a big headstart.