401 with V3 API key

[gulprun]

Any new V3 api keys show the error with this sdk:

`````````````Testing authenticated endpoint (account)...
Error: API error: 401 [UNAUTHORIZED] - Key is not valid
`

[CaoKha]

I can’t reproduce your API key error. Could you provide more details?
In the example, I set APIClientConfig to use hostname=testnet4. That may have caused the error if you were using a mainnet API key. I’ve updated the example, so it should be fixed now.