title: Yelp API Validation_Error when making post request
body: <p>I'm trying to get an access token from the Yelp API and have read the instructions from the developers page as well as the documentation for requests and when I try to make the request, it returns <code>{"error": {"code": "VALIDATION_ERROR", "description": "/oauth2/token/"}}</code> I looked up error codes on the Yelp developer page but didn't find this error code.</p>
  
  <pre><code>import json
  from pip._vendor import requests
  clientID= 'my id as a string'
  clientSecret ='my secret as a string'
  par = {'grant_type' : 'client_credentials', 'client_id':clientID,'client_secret':clientSecret}
  content = requests.post('https://api.yelp.com/oauth2/token/',params=par)
  print(content.text)
  </code></pre>
  
  <p>Can someone please help me see what's wrong? Thanks in advance.</p>