American Express
OpenID Configuration
https://www.americanexpress.com/.well-known/openid-configuration
Also Discoverable Via
Active Keys
| KID | Use | Alg/Crv | Key Length | Observed |
|---|---|---|---|---|
| src-amex-card-enc-0726 | enc | RSA-OAEP-256 | 3072 | 2026-08-11 |
| src-amex-idtoken-0726 | sig | RS256 | 3072 | 2026-08-11 |
| src-amex-payload-sign-0726 | sig | RS256 | 3072 | 2026-08-11 |
| src-amex-card-enc-2026 | enc | RSA-OAEP-256 | 3072 | 2026-04-14 |
| src-amex-idtoken-2026 | sig | RS256 | 3072 | 2026-04-14 |
| src-amex-payload-sign-2026 | sig | RS256 | 3072 | 2026-04-14 |
Recently Deactivated Keys
| KID | Use | Alg/Crv | Key Length | Observed |
|---|---|---|---|---|
| src-amex-card-enc-2025 | enc | RSA-OAEP-256 | 3072 | 2026-04-14 to 2026-08-11 (119 days) |
| src-amex-idtoken-2025 | sig | RS256 | 3072 | 2026-04-14 to 2026-08-11 (119 days) |
| src-amex-payload-sign-2025 | sig | RS256 | 3072 | 2026-04-14 to 2026-08-11 (119 days) |