parameters: (self, key, cert, domain)
docstring: Add a key and cert that will be used
          any time a request requires authentication.
docstring_summary: Add a key and cert that will be used
          any time a request requires authentication.
docstring_tokens: Add a key and cert that will be used any time a request requires authentication .
function: def add_certificate(self, key, cert, domain):
          """Add a key and cert that will be used
          any time a request requires authentication."""
          self.certificates.add(key, cert, domain)
function_tokens: def add_certificate ( self , key , cert , domain ) : self . certificates . add ( key , cert , domain )