Using Sigma For Authenticating With More than just client-id & secret

Using Sigma For Authenticating With More than just client-id & secret

I am trying to use Sigma to authenticate my Desk Extension to an external API. 
OAuth2 gives options for "Client Id", "Client Secret", and "Access Token URL" , but I also need to add additional query fields to authenticate. Would simply appending the fields to the access token url like so: "desk.zoho.com/api?field1=value&field2=value2" be the solution? 

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