Q: How do I set up a purchase event in GA4 from scratch?

Q: How do I set up a purchase event in GA4 from scratch?
A: Use the exact purchase recommended event so it auto-feeds reports. Walk this order:
— Fire purchase with transaction_id, value, currency, and an items array (skip any and revenue breaks).
— Confirm it lands: Admin → DebugView, trigger a test buy, watch the event fire with parameters attached.
— Admin → Events, wait 24h, toggle 'Mark as key event'.
— Admin → Data display → Currency: set the property currency to match what you send.
TL;DR: Send purchase with transaction_id + value + currency + items, verify in DebugView, then mark it as a key event.
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