Returns whether the handle is available or not.Ask AIget https://api-partner.noba.com/v1/consumers/handles/availabilityQuery ParamshandlestringrequiredHeadersx-noba-api-keystringrequiredx-noba-signaturestringx-noba-timestampstringTimestamp in milliseconds, use: new Date().getTime().toString()Responses 200False or True specifying whether the specified 'handle' is already in use or not 403Logged-in user is not a ConsumerUpdated over 3 years ago