Currently, the shrinkwrap API does not (seem to) support programmatic authentication for RemoteRepos but only credentials integration via maven settings.

It would be great if we could use also the API to provide credentials, e.g. when adding a repo to a resolver instance

 val resolver = Maven.configureResolver().withMavenCentralRepo(true)
            .withRemoteRepo("jcenter", "https://jcenter.bintray.com/", "default", "<USERNAME>", "<PASSWORD>")

(The last 2 args are just mock and are not supported yet)

E.g. https://github.com/jcabi/jcabi-aether supports this mode (but is no longer developed)

Also, see kscripting/kscript#239 (comment)