Jira Server Post Oauth 1.0a in Groovy

I am integrating Xray for Jira into our data center server. I have followed the Jira documentation for setting up Oauth but it appears to be only for Get requests. We need to post our results. Basic Authentication using Groovy and HTTPClient works without any issue. I am trying to find information on using HTTPClient to post my request using Oauth 1.0a. Should we use the values from the config.properties to do the post? If so, does someone have an example in Java or Groovy that works with Jira Server or Data Center.

Thank you