Phone call triggered by Homey

Hello Cris,
My provider (SMSflatrate) is shutting down.
Now I’m looking for a new provider and have found ClickSend. The costs are reasonable, since I only need it in an emergency.
How do you pass the command from homey to ClickSend?
Via webhook?
What does the string look like then?

Thanks for an answer

this is my webhook:

(https://www.smsflatrate.net/schnittstelle.php?key=46#########b6c91c49&from=homey&to=0049176#####7&text=Achtung+Rauch+im+Heizungsraum++++Achtung+Rauch+im+Heizungsraum&type=30)