Input your developer account domain
Consumer Key as the ClientID
Consumer Secret as the ClientSecret
The Key does not need to be entered. SALESFORCEcustom module first queries the Salesforce token endpoint using the OAuth2.0 client credentials workflow to obtain the token and sets it to the encrypted Key custom field.
The API version is set to default to v59.0. You can find what version you are using by going to <your domain>/services/data/.