unity-sdk
                                Unity SDK for cross-platform in-app purchase and subscription infrastructure, revenue analytics, engagement automation, and integrations
                            
                        How to download and setup unity-sdk
Open terminal and run command
                                            git clone https://github.com/qonversion/unity-sdk.git
                                        
                                        git clone is used to create a copy or clone of unity-sdk 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 unity-sdk https://github.com/qonversion/unity-sdk/archive/master.zip
Or simply clone unity-sdk with SSH
                                            [email protected]:qonversion/unity-sdk.git                                    
                                    If you have some problems with unity-sdk
You may open issue on unity-sdk support forum (system) here: https://github.com/qonversion/unity-sdk/issuesSimilar to unity-sdk repositories
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