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 payment settling gross by CLABE. Real SPEI operation depends on each participant's intraday balance, queue management, and Banco de Mexico's message and signature rules, which are omitted here. Every failure here is authored on Mexico SPEI — Banco de Mexico's interbank system, with the sources that back it.