Can I setup a subdomain?
Yes, you can. To do so, just go to your GitLab app in the NWS Customer Interface and click on "Settings". Open the "CNAME"- tab and fill in your subdomain.
Do you provide OAuth for user integration?
Yes, GitLab provides OAuth for an easy user integration. Just go to your GitLab app in the NWS Customer Interface and click on "Settings". You can drop your OAuth credentials to use the pre-configured providers (GitHub, Twitter, Goolge, Facebook, GitLab.com, BitBucket, AzureAD, ADFS) at "External authentication with OAuth".