feat: Implement payment processing with contract auditing, event loops, and web observability endpoints.

tests/test_payment_contract_audit.py

@@ -0,0 +1,18 @@
+import os
+
+from src.payments.contract_audit import analyze_checkout_contract
+
+
+def test_payment_contract_audit_detects_current_controls():
+    report = analyze_checkout_contract(
+        os.path.join("contracts", "PolyWeatherCheckout.sol")
+    )
+
+    assert report["checks"]["has_only_owner_modifier"] is True
+    assert report["checks"]["allowed_token_check"] is True
+    assert report["checks"]["duplicate_order_check"] is True
+    assert report["checks"]["paid_order_written_before_transfer"] is True
+    assert report["checks"]["has_pause_switch"] is False
+    assert report["checks"]["binds_plan_amount_onchain"] is False
+    assert any(risk["id"] == "single_owner_admin" for risk in report["risks"])
+