Run It Twice, Charge Once: Idempotency Keys in n8n

This is part of my build-in-public series on running LLM workflows in n8n in production. Everything here is from real templates I sell and support — the mistakes are mine, the fixes are tested. The customer got charged twice, and every log said "success" A workflow sent a payment, then a message, then a record update. One night the provider call... Weiterlesen: Run It Twice, Charge Once: Idempotency Keys in n8n