On July 27, 2026, a fault inside Faster Payments, the UK’s shared interbank rail, stalled transfers at Barclays, Lloyds, Halifax, HSBC, Monzo, and Revolut all at once. For subscription businesses billing UK renewals by direct debit or open banking transfer, the outage exposed a visibility gap: a card decline shows up instantly, but a rail-level A2A failure can sit unconfirmed for hours, with real duplicate-charge risk on retry.