password, refresh_token, and client_credentials grants.curl --location 'https://api.studiointern.de//v2/oauth/token' \
--header 'X-Api-Key: <api-key>' \
--header 'Content-Type: application/json' \
--data '{
"grant_type": "password",
"client_id": "string",
"client_secret": "string",
"username": "string",
"password": "pa$$word",
"refresh_token": "string",
"scope": "string"
}'{
"access_token": "string",
"token_type": "Bearer",
"expires_in": 0,
"expires_at": 0,
"refresh_token": "string"
}