To host your own version, simply fork the repo and npm install your own fork.
npm i github:<your github>/dc-integration-middleware
That's really it.
Or, if you're using it with our eComm Toolkit Extension, update the dependency in that package.json to point to your fork.
"@amplience/dc-integration-middleware": "git+https://github.com/yourgithub/dc-integration-middleware.git"
Note: we recommend keeping @amplience in the json key above, otherwise you'll need to update any imports referencing @amplience
If you make updates to the integration that require your own version of the Toolkit extension, you'll also need to host that extension on your own as well.
Finally, as this is an open source project, feel free to PR any updates you make that you think would be useful to the larger community!