I'm trying to setup a site with Paypal logins. I'm using the default Umbraco functionality for the external logins, along with a 3rd party library to handle the authorisation with PayPal: https://github.com/aspnet-contrib/AspNet.Security.OAuth.Providers

I tried using it out-of-the-box only to find that apparently the library auths against live URLs by default. I followed the instructions in this thread: https://github.com/aspnet-contrib/AspNet.Security.OAuth.Providers/issues/198 and updated the URLs to the ones mentioned, so I now have the following:

logins.AddMemberLogin(
memberAuthenticationBuilder =>
{
    memberAuthenticationBuilder.AddPaypal(
        // The scheme must be set with this method to work for the umbraco members
        memberAuthenticationBuilder.SchemeForMembers(PayPalMemberExternalLoginProviderOptions.SchemeName),
        options =>
        {
            options.ClientId = clientId;
            options.ClientSecret = clientSecret;
            if (isDevelopment)
            {
                options.AuthorizationEndpoint = "https://www.sandbox.paypal.com/webapps/auth/protocol/openidconnect/v1/authorize";
                options.TokenEndpoint = "https://api.sandbox.paypal.com/v1/identity/openidconnect/tokenservice";
                options.UserInformationEndpoint = "https://api-m.sandbox.paypal.com/v1/identity/oauth2/userinfo?schema=paypalv1.1";
            }
        });
});

However this approach doesn't seem to work 100% for me. Sometimes it allows me in, other times it doesn't authorize, or seems to kick the user out immediately so that every request involves having to sign in again.

I was wondering if anyone had successfully implemented this in their project and how they did it?

I was recommended to use Javascript and their REST APIs but since I'm using Umbraco I'd prefer to use back-end.. but at this point I'm open to anything.

Thanks