php - Facebook Messenger API webhook trouble -

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i trying setup webhook facebook messenger bot platform , receiving error: 

the url couldn't validated. response not match challenge, expected value = '892694233', received='892694233<link rel...'

i using heroku host testing , callback url ssl, project on laravel 5.2 , code processs webhook setup

if ($request->get('hub_verify_token') == config('services.bot.verification_token')) {         return (new response())->setcontent($request->get('hub_challenge'));     }  return (new response())->setcontent('error: token mismatch');

i'm not familiarized lavarel, looks way extracting value of parameter hub.challenge giving wrong value: '892694233

if return number in response ('892694233') should work. maybe can clean result of calling $request->get('hub_challenge') in order remove text @ end?


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