In order to add additional parameters to your token requests, you could follow the below steps:
* Navigate to the Authentication tab of the datasource where the Authentication method has been set up as OAuth 2.0.
* Scroll to the end of the ‘Authentication’ tab page.
* Click on ‘Extra parameters of the refresh token requests’.
* Add ‘New’, with the variable name as ‘content-type’ and value as ‘application/json’ and click Ok.
You may refer to the [HTTP Path](https://community.denodo.com/docs/html/browse/7.0/vdp/administration/creating_data_sources_and_base_views/path_types_in_virtual_dataport/http_path#oauth-2-0) section of the Virtual DataPort Administration guide for more information.
Hope this helps!