Do I need to know how to code to build a workflow?

No. You build a workflow by talking through it. The interview asks what the job is, what starts it, which systems it touches and what a finished run looks like, and it writes the standard operating procedure with you as you answer.

Then the first runs happen with you watching. The agent does the work, you correct it where it gets something wrong, and every run you accept becomes a concrete example the workflow keeps. None of that asks you to read Python, know what a webhook is, or map a field to a JSON path.

Code does get written eventually. Once you decide the workflow has seen enough, the codification walk-through turns the understood parts into deterministic steps, and the agent writes those steps. What you review is the behaviour, not the source.

The thing you do need is the process itself. If you cannot say what should happen when the invoice arrives in a currency nobody planned for, the workflow cannot either, and that gap is what the walk-through is for.