Submit data to radmon.org with node-red

The Achievement.
After a long series of favourable accidents, I have managed to get my rpi 4B up and  running as a local server and database for my environmental monitoring data - all powered by solar.
This miracle has been made possible with the use of nginx server, node-red, influxdb, Grafana, and my very limited intellect.

The Problem.
Over the years I have bought quite a number of geiger counter kits from brohogan (https://sites.google.com/site/diygeigercounter/) and currently am using 3x gk-b5 + gk-wifis and a gk-radmon to submit my data to radmon, thingspeak, and, now, my own database via mqtt.
So, recently I decided to see if I could magick a 5th counter into the fray via USB connected directly into the rpi server, as a bit of fun, and have mostly succeeded. - CPM, Dose, Vcc through USB0 > node-red > influxdb, thingspeak, Grafana. BUT - I cant work out how to send the CPM to radmon.org using node red. I think it's down to adding CPM payload to radmon submission htpp string, or some such.
Would someone be so kind as to point me in the right direction?

Thank you Simomax. Followed the link and it looks promising. Working on it now...The terminology is counter intuitive - I wasn't aware that posting data to my radmon station was a "query".

I got it working, thank you once again simomax :-}