# External source check (PPA-20260831)

Checked 2026-09-04 with `scripts/verify-external-sources.py` (GET, follow redirects, 25s timeout). None of these pages audited this fixture. Machine log: [`external-source-check-PPA-20260831.json`](./external-source-check-PPA-20260831.json).

| Source | Requested URL | Final URL | HTTP | Title SHA-256 | Note | Use |
|---|---|---|---|---|---|---|
| Q3 2023 results exhibit | https://www.sec.gov/Archives/edgar/data/1842731/000184273123000023/a6-kxexhibit991xq33092023.htm | https://www.sec.gov/Archives/edgar/data/1842731/000184273123000023/a6-kxexhibit991xq33092023.htm | 200 | d6bd8c0aeee80fed |  | Not a universal definition, benchmark, endorsement, or validation of this sample. |
| Non-GAAP Financial Measures C&DIs | https://www.sec.gov/rules-regulations/staff-guidance/corporation-finance-interpretations/non-gaap-financial-measures | https://www.sec.gov/rules-regulations/staff-guidance/corporation-finance-interpretations/non-gaap-financial-measures | 200 | 46895adbf556c1a2 |  | Not a ruling that this educational metric is GAAP, compliant, or audited. |
| Implementing Cross-Channel Measurement for Marketers Playbook | https://www.iab.com/wp-content/uploads/2024/11/IAB_Implementing_Cross-Channel_Measurement_forMarketers_Playbook_November_2024.pdf | https://www.iab.com/wp-content/uploads/2024/11/IAB_Implementing_Cross-Channel_Measurement_forMarketers_Playbook_November_2024.pdf | 200 | — |  | Does not prove causal incrementality, certify attribution, or reproduce this sample. |
| Invoice object | https://docs.stripe.com/api/invoices/object | https://docs.stripe.com/api/invoices/object | 200 | ab275f1fac66f783 |  | Does not prove source completeness, revenue recognition, attribution, or CAC recovery. |
| Producer Price Index release | https://www.bls.gov/news.release/ppi.htm | https://www.bls.gov/news.release/ppi.htm | 200 | 16a203f069f9341b |  | Does not measure a company's CAC, contribution, customer behavior, or payback. |

Keep original requested URLs. Re-check at decision time.