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 correspondent carries the cover. Real flows may involve correspondents on both sides, foreign-exchange conversion, and charge deductions along the chain. Every failure here is authored on ISO 20022 cover payment (pacs.008 + pacs.009 COV), with the sources that back it.