@swt
What problem are you having specifically about the parameter passed in?
Powerapps will encode the spaces in the URL as +
I don't believe there is any way around that. So, for your case, if you encode with %20, it will convert to +
The best you can do is Substitute(Param("Name"), "+", " ")
As long as your not passing a +, this will get you your results.
Hope that helps.