<PackageReference Include="System.ServiceModel.Primitives" Version="8.1.2" />

System.ServiceModel.Security.Tokens.BufferedGenericXmlSecurityToken

class BufferedGenericXmlSecurityToken : GenericXmlSecurityToken
public XmlBuffer TokenXmlBuffer { get; }

public BufferedGenericXmlSecurityToken(XmlElement tokenXml, SecurityToken proofToken, DateTime effectiveTime, DateTime expirationTime, SecurityKeyIdentifierClause internalTokenReference, SecurityKeyIdentifierClause externalTokenReference, ReadOnlyCollection<IAuthorizationPolicy> authorizationPolicies, XmlBuffer tokenXmlBuffer)