Based on our record, Shift4 Payments seems to be more popular. It has been mentiond 1 time since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Nerdwallet.com has a nice list of them. I only have experience with square though. I know you can resell shift4.com. But I don't know the requirements. Shopify has a POS as well and I am sure there are TONS of users on here using it. Source: over 2 years ago
HireRight - HireRight provides on-demand employment screening solutions for a global customer base of organizations.
Workday - Workday is an on‑demand financial management and human capital management software solution.
GoodHire - GoodHire is an employment screening service with solutions for businesses of every size.
Paylocity - Paylocity has revolutionized the industry and has quickly become the leading independent provider of online payroll services and HR solutions.
Checkr - Run background checks automatically and securely with Checkr's RESTful API
UltiPro - UltiPro is another HR application available to use on multiple platforms such as Android and iOS etc.