Strava API auth please HELP

I am attempting to create a very simple rails API app. I need to be able to authenticate within my application in order to access my data. authentication is a four-part process, I have done this successfully with Postman but now I need to do this within my application. the doc's on strava https://developers.strava.com/docs/getting-started/#getsupport. I could use an example of how to walk through his process please let me know of any example apps or the best tutorial here on this site or somewhere else.