3D FlipBook - Apply license to npm library

Hi, I just bought a one time license for pro version. now I try to integrate with React App and I follow the step from this guide https://github.com/iberezansky/flip-book-jquery-example. but seem like it use flipbook on npm version which latest version is 1.9.9. and I can't find a document to apply my pro license.

question is, How can I input my license.

Thank you in advance