[req-abc123] gateway:request:POST:/orders
[req-abc123] order:created:order_id=5001
[req-abc123] order:calling_payment
[req-abc123] payment:processing
[req-abc123] payment:authorized
[req-abc123] order:payment_ok
[req-abc123] gateway:response:status=200
[req-def456] gateway:request:GET:/orders/5001
[req-def456] order:lookup:order_id=5001
[req-def456] order:found:status=paid
[req-def456] gateway:response:status=200
[req-ghi789] gateway:request:POST:/orders
[req-ghi789] order:created:order_id=5002
[req-ghi789] order:calling_payment
[req-ghi789] payment:processing
[req-ghi789] payment:error
[req-ghi789] order:payment_failed
[req-ghi789] gateway:error:status=500
