RPM has its own key store
Unlike Debian-based systems, RPM-based distros (Fedora, RHEL, CentOS, AlmaLinux) keep trusted GPG keys inside the RPM database itself rather than as separate keyring files.
Importing a key
If the vendor publishes a direct URL to their public key, importing is a single command:
sudo rpm --import https://example.com/RPM-GPG-KEY-example
If you only have a key ID, fetch it from a keyserver first, then pipe the exported key into rpm --import.