https://developers.trustpilot.com/authentication Required. Identifier of application that is associated with the authentication token. Specify application client secret. Optional. Required. Specify the redirect uri you have set during creation of the app. https://developers.trustpilot.com/authentication#auth-code https://developers.trustpilot.com/authentication Required. Specify API key. Required. Specify API secret. Required. Specify the user name. Required. Specify the password.