The parameters are mostly server states. What’s interesting to you should be “what am I signing” (since that’s the only part they didn’t provide you in the firs

The parameters are mostly server states. What’s interesting to you should be “what am I signing” (since that’s the only part they didn’t provide you in the first place) and it’s a JSON blob that’s fairly understandable. A small client is still going to send the same payload.