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Unfortunately the rpm is not there, neither in the oci included repo not in the OL7 repo referenced in the ords 25.1 documentation:
https://yum.oracle.com/repo/OracleLinux/OL7/oracle/software/x86_64/
https://docs.oracle.com/en/database/oracle/oracle-rest-data-services/25.1/ordig/installing-and-configuring-oracle-rest-data-services.html#GUID-6076DC47-0218-4B37-91E2-FA7D4BA1F834
The OL8 and OL9 repo do have the 25.1 rpm, but for OL7 it seems to have been forgotten.