Web services validating the sender
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And that after all is what Web Services are about making server side logic easily available to client applications.
User authentication verifies the identity of the user or the system trying to connect to the service.
Such authentication is usually a function of the container of the web service.
Rule - TLS must be used to authenticate the service provider to the service consumer.
The service consumer should verify the server certificate is issued by a trusted provider, is not expired, is not revoked, matches the domain name of the service, and that the server has proven that it has the private key associated with the public key certificate (by properly signing something or successfully decrypting something encrypted with the associated public key).