The largest payments network, by volume, is the ACH network. A dollar value of several times US GDP flows through the network each quarter. It is a 50-year-old network that is reliable, ubiquitous, and still growing. While several shiny new payment rails have been developed, the workhorse of the economy remains ACH and will remain so for some time.My next guest on the Fintech One-on-One podcast is Jane Larimer, the President and CEO of Nacha, the organization that governs the ACH network. Whi...