Square php sdk integration

i have an error during integration of square php sdk
getting this error square.js:1 Unexpected token ‘<’, “
”… is not valid JSON while parsing the url “https://sandbox.web.squarecdn.com/v1/square.js” when i check the url response it indicates Failed to load resource: the server responded with a status of 403 ()

What version of PHP are you using? :slightly_smiling_face: