Startup.Auth.vb

app.UseTwitterAuthentication(
    New TwitterAuthenticationOptions With {
        .ConsumerKey = "xxx",
        .ConsumerSecret = "xxx",
        .Provider = New TwitterAuthenticationProvider With {
            .OnAuthenticated = Async Function(context)
                                   context.Identity.AddClaim(New Claim("urn:tokens:twitter:accesstoken", context.AccessToken))
                                   context.Identity.AddClaim(New Claim("urn:tokens:twitter:accesstokensecret", context.AccessTokenSecret))
                               End Function
            },
        .BackchannelCertificateValidator = New CertificateSubjectKeyIdentifierValidator(New String() {
            "A5EF0B11CEC04103A34A659048B21CE0572D7D47",
            "0D445C165344C1827E1D20AB25F40163D8BE79A5",
            "7FD365A7C2DDECBBF03009F34339FA02AF333133",
            "39A55D933676616E73A761DFA16A7E59CDE66FAD",
            "4eb6d578499b1ccf5f581ead56be3d9b6744a5e5",
            "5168FF90AF0207753CCCD9656462A212B859723B",
            "B13EC36903F8BF4701D498261A0802EF63642BC3"})
        })