PKI certificate issuance flexibility with Vault CIEPS

''HashiCorp Vault Enterprise 1.15 introduces Certificate Issuance External Policy Services (CIEPS) to address the need for custom fields and extensions in X.509 public key infrastructure certificates, allowing customers to build a custom policy service that runs outside of Vault and offers granular control and flexibility in certificate structures, while maintaining a consistent user experience and complete auditability of the issuance process.