Need help with Webhook program

Greetings! I have a Nodemcu with several pins and I wish to send data collected to thingspeak using Webhook (Blynk app on iOS). I’ve set up a single pin, and it displays collected temperature readings, but I can’t figure out how to send other info alongside it. Unfortunately, the documentation is too confusing for me. Can anyone provide me with example code of how to use Webhook with multiple pins? Specifically, what should I write in the scetch for Nodemcu, what shouild be written in the “url” and the “body” fields in Webhook settings?

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Pete, thank you very much