PayPal 401 Unauthorized with credit card payment in live production using .NET REST API for Express checkout API

Question

I'm using .NET REST API for PayPal Express Checkout for direct credit card payment. When I use sandbox, I create Payment, set credit card as funding instrument, billing address and payment works fine. But when I switch to live, calling Payment.Create(apiContext) with the exactly same data throws PayPal.IdentityException with 401-Unauthorized message. However, at that time I have valid access token. Calling regular PayPal payment works fine either using live environmnet.

Thanks for any suggestions.

Answer 1

I found a solution to this problem. It is necessary to determine sdkConfig in apiContext.

        var sdkConfig = new Dictionary<string, string> { { "mode", "live" } };
        string accessToken = new OAuthTokenCredential(id, secret, sdkConfig).GetAccessToken();


        var apiContext = new APIContext(accessToken);
        apiContext.Config = sdkConfig;