What happens when this goes wrong?
Every other page shows this payment working. Here you choose what breaks, and follow the damage — because a hold, a return or a missed cut-off is the system working as designed, and reading one calmly is the job.
Pick a failure above. Nothing here is invented — each one is a reason code this rail really uses, at the step where it really strikes.
One collection in a single batch cycle with direct participants. Real NACH processes large batches across scheduled cycles, with separate presentment and return windows and mandate registration handled ahead of time. Every failure here is authored on India NACH Debit, with the sources that back it.