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Workflow uses urlschemes mostly, but at least one co-founder (Conrad Kramer) has a background in reverse engineering and jailbreak tools, which probably helped him discover undocumented urlschemes in apps. Here's a great presentation he gave on reverse engineering lyft: https://realm.io/news/conrad-kramer-reverse-engineering-ios-...

Mostly by URL scheme. Each app can provide any number of url schemes like workflow: or app-settings: or etc. Then they can use data from that URL or the clipboard.

Apps register URIs, so methods and screens can be tied to addresses. Workflow routes data between them.