Since this is a project based book, the code continues from one chapter to the next. To start working on this chapter's code, please work with your copy of the completed Chapter 3, Cloud Vision API code. Or, you can get it from https://github.com/PacktPublishing/Getting-Started-with-Google-Cloud-AI-Services/tree/master/Chapter%204. Once you have downloaded the code locally from GitHub, make sure you have updated the required API keys and database connections to continue.