- test_stripe_sandbox.py: API-only validation of all 17 products (67 tests) - stripe_e2e_setup.py: webhook endpoint registration via ngrok - stripe_e2e_test.py: live webhook tests with real DB verification (67 tests) - stripe_e2e_checkout_test.py: checkout webhook tests for credit packs, sticky boosts, and business plan PDF purchases (40 tests) Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>