1) The defaultRequestHeaders property of the REST connector (https://backstage.forgerock.com/docs/idm/6.5/connector-reference/#basic-configuration-properties-properties-org-forgerock-openicf-connectors-scriptedrest-ScriptedRESTConnector-188.8.131.52) has no documented example.
It would not be an issue if the values to use were obvious, which is not the case: in order for that connector to generate for example the "Authorization: Bearer rg1cwAeQJxEf" HTTP header, the value to use is as follows in the provisioner file:
"defaultRequestHeaders" : [ "Authorization = Bearer rg1cwAeQJxEf" ]
Please notice the use of the equal sign rather than the colon character.
2) Also, I noticed that when doing the search below on backstage, I get not result (??):