The Web Payments Frontend can essentially be accessed from any environment.
We don't have official sample code available for doing this with node.js
However, one of our users has submitted the following code snippets on Github that you can reference.
Code for retreiving the WPF URL - https://gist.github.com/ianpetzer/7004202
Code for making payment using a stored card - https://gist.github.com/ianpetzer/7115687
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