Cannot find module wix-paid-plans-backend

I’m trying to access the wix-paid-plans-backend module from routers.js, but the import fails with this message (shown in the site monitor). The import statement I’m using is as suggested by the editor:

import wixPaidPlansBackend from 'wix-paid-plans-backend';

The error message (extracted from the JSON in site monitor) is:

["Cannot find module 'wix-paid-plans-backend'\nRequire stack:\n- /user-code/backend/routers.js\n- /user-code/stubmodule-that-does-the-require.js\n- /elementory/node_modules/scoped-require/index.js\n- /elementory/create-app.js\n- /elementory/cloud-grid-runner.js"]

Does anyone know what the problem could be?

You won’t as to use Wix Paid Plans through your Backend, you need to be using them in events.js as stated in the Wix API Reference.
https://www.wix.com/corvid/reference/wix-paid-plans-backend.html
https://www.wix.com/corvid/reference/wix-paid-plans-backend.Events.html