If only NACHA files were JSON as shown in the example in the article.
I wrote a NACHA processor in MS Access many years ago for a client in the insurance industry. That thing is still being used. God, I wish it would die. Although, I'm not sure which is worse: Parsing and generating the NACHA record format, or trying to parse and generate JSON in VBA.
Why MS Access? Their entire claims processing system (which I did not write) ran on it. I only just got that damn thing migrated to an MSSQL backend. The pain.