[OSM-dev] OAuth2 in C#

[Michele OSM3]

I tried to get authorization code via:
https://master.apis.dev.openstreetmap.org/oauth2/authorize?client_id=(
client_id)&response_type=code&scope=read_prefs+write_api&access_type=offline&redirect_uri=urn:ietf:wg:oauth:2.0:oob

it returns me a web page with the authorization code.

Now I would like to try to get the authorization code using rest-get in C #
or Postman.
I guess the parameters are different to get a response in json instead of a
webpage.
Can someone help me?
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