How to download and setup nexmo-developer
Open terminal and run command
                                            git clone https://github.com/Nexmo/nexmo-developer.git
                                        
                                        git clone is used to create a copy or clone of nexmo-developer 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 nexmo-developer https://github.com/Nexmo/nexmo-developer/archive/master.zip
Or simply clone nexmo-developer with SSH
                                            [email protected]:Nexmo/nexmo-developer.git                                    
                                    If you have some problems with nexmo-developer
You may open issue on nexmo-developer support forum (system) here: https://github.com/Nexmo/nexmo-developer/issuesSimilar to nexmo-developer repositories
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