The goal of onelogin is to wrap the API for the identity provider 'OneLogin'.
You can install the current version of onelogin on CRAN at https://CRAN.R-project.org/package=onelogin or the development version from 'github' using
devtools::install_github("akgold/onelogin")
This is a basic example which shows you how to get all users:
library(onelogin)
con <- onelogin()
ol_users_get(con)