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Error while accessing endpoint for access token: https://api.criteo.com/oauth2/token

When we the POST request the above endpoint we get the "invalid_request" error and it says that the "field [grant_type] is not provided". But we have added the client_id, client_secret & grant_type as per the documentation. Please rectify the issue.

doc: https://developers.criteo.com/marketing-solutions/reference/oauth

postman screenshot: