parsing \\xc3\\xb6 from a url

I'm trying to support an API, it's a remote server pushing data to me. When passing data, reading directly from $_GET['value'] I get strings with this in them:\xc3\xb6They also needed a very specific url structure, which I've had to use curl to work around. When using curl on the api I get this instead:\xc3\xb6Is the problem on my side or on his? How can I decode this reliably? Is there a better way than using curl available? (If neccesary I'll recode that part of it to skip curl, I just wanna get it working at this point).//edit : Note that I'm writing the $_GET['value'] directly to a file to test. And it looks the same.
 
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