Zuykov, I. 2026. Designing Secure Microservices on Kubernetes: An Architectural Deep Dive into OAuth2, PKCE, Keycloak, Vault, and LDAP. The American Journal of Engineering and Technology. 8, 05 (May 2026), 58–69. DOI:https://doi.org/10.37547/tajet/Volume08Issue05-07.