Convert heroku based project to condensed plain library

I got a variations generator developed which uses the Heroku framework. The downside is that I don't know the framework so that in addition to not being much a coder means there's too many moving parts for this to be usable for me. I can't seem to move it to other LAMP environments without it breaking and I've tried a few. I get a 404 error for the request path /product-variations/web/api/v1/variations Here is the live version that seems to work [login to view URL] I want the core functionality for the variations generator extracted and converted to just a few files rather than depend on the Heroku framework. The work done was just a couple of files, but I want to know I can copy/paste the code anywhere within reason without it breaking and having to depend on hundreds of other files.