rails_api_auth
                                Lightweight Rails Engine that implements the "Resource Owner Password Credentials Grant" OAuth 2.0 flow as well as Facebook authentication
                            
                        How to download and setup rails_api_auth
Open terminal and run command
                                            git clone https://github.com/mainmatter/rails_api_auth.git
                                        
                                        git clone is used to create a copy or clone of rails_api_auth repositories.
                                        You pass git clone a repository URL. it supports a few different network protocols and corresponding URL formats.
Also you may download zip file with rails_api_auth https://github.com/mainmatter/rails_api_auth/archive/master.zip
Or simply clone rails_api_auth with SSH
                                            [email protected]:mainmatter/rails_api_auth.git                                    
                                    If you have some problems with rails_api_auth
You may open issue on rails_api_auth support forum (system) here: https://github.com/mainmatter/rails_api_auth/issuesSimilar to rails_api_auth repositories
Here you may see rails_api_auth alternatives and analogs
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