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Adjust request signing
In order to use POST binding, TElSAMLServiceProvider.SPToIDPBinding property should be set to TSBSAMLBindingType.sbtPost. Depending on the request type one should set TElSAMLServiceProvider.SignAuthnRequests / SignLogoutRequests / SignArtifactResolveRequests properties to 'true'. TElSAMLServiceProvider.SigningCertificate property must be initialized with an instance of TElX509Certificate that contains the signing certificate.