API integration is the connection between two or more applications via their APIs (application programming interfaces) that allow systems to exchange data sources. API connectivity helps applications share data and communicate with each other without human interruption. You enable communication between two web tools or applications through their APIs. It allows organizations to automate systems, enhance the seamless sharing of data, and integrate current applications.
Goto Settings > Business Settings > Preferences > myBooks APIs
Click on myBooks APIs,
myBooks APIs window opens, here you can generate the API key for the integration process.