Square Client to Obtain Token

Questions
2

What version are you looking at? That was there previously for refreshing a token but isn’t required. For example:

var body = new ObtainTokenRequest.Builder(
        "APPLICATION_ID",
        "APPLICATION_SECRET",
        "authorization_code")
    .Code("CODE_FROM_AUTHORIZE")
    .Build();

try
{
    ObtainTokenResponse result = await oAuthApi.ObtainTokenAsync(body);
}
catch (ApiException e){};