For software applications that have an end-user base in a subscription model or include recurring transactions, an Ach Processing Api is a must. Sure, few of these SaaS applications would want to discount the use of credit card processing because it's a commonly used payment modal, but being subscription based sets the application into an area of knowing their customer base much differently than some business that sells widgets on a one-time basis to consumers that might never revisit or occasionally purchase goods or services. Moreover, customers of these subscription based businesses more than likely rely on receiving their goods or services that the organization and SaaS provides.