REST Data Management is available in OUD versions 188.8.131.52+. REST Administration Management is available in OUD versions 184.108.40.206+. For more info - OUD 12c - Testing and Using the Admin REST APIs for OUD Administration and Configuration (Doc ID 2441097.1)
Since REST Data Management requires 220.127.116.11.0 and there is no direct upgrade from 11g to 18.104.22.168.0, then an installation of OUD version 22.214.171.124.0 is required to upgrade to version 126.96.36.199.0. For more info - 12c Upgrade Example - Upgrading an OUD 188.8.131.52.x Installation/Instance to 184.108.40.206.0 (Doc ID 2627631.1)
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