ACH Payment Processor Check Commerce is a Phoenix-based company that specializes in working with ISOs, Resellers, Integrated Partners, and Third-Party Senders. We only focus on ACH and check-related products and services. This allows us to partner with credit card ISO's to become their "ACH Department." Because of our laser focus, we can seamlessly provide an organization with multiple options to make their ACH processing simple, profitable, and secure. Our partners find when they can focus on their best dollar-generating activities and leverage their ACH processing to Check Commerce, everyone involved has less hassle and becomes more profitable.