this has been resisted for quite some time, since in a standard use it is easy to forge requests if the secret is compromised. However, Many clients require this and we should therefore support it. See https://jira.ncsa.illinois.edu/browse/CIL-2106 as well.
Support the client credentials flow: https://www.rfc-editor.org/rfc/rfc6749#section-4.4
this has been resisted for quite some time, since in a standard use it is easy to forge requests if the secret is compromised. However, Many clients require this and we should therefore support it. See https://jira.ncsa.illinois.edu/browse/CIL-2106 as well.