code: def get_interface_reactions(self, reactant1, reactant2,
                                  open_el=None, relative_mu=None,
                                  use_hull_energy=False):
          
          payload = {"reactants": " ".join([reactant1, reactant2]),
                     "open_el": open_el,
                     "relative_mu": relative_mu,
                     "use_hull_energy": use_hull_energy}
          return self._make_request("/interface_reactions",
                                    payload=payload, method="POST")
docs: Gets critical reactions between two reactants.
  
          Get critical reactions ("kinks" in the mixing ratio where
          reaction products change) between two reactants. See the
          `pymatgen.analysis.interface_reactions` module for more info.
  
          Args:
              reactant1 (str): Chemical formula for reactant
              reactant2 (str): Chemical formula for reactant
              open_el (str): Element in reservoir available to system
              relative_mu (float): Relative chemical potential of element in
                  reservoir with respect to pure substance. Must be non-positive.
              use_hull_energy (bool): Whether to use the convex hull energy for a
              given composition for the reaction energy calculation. If false,
              the energy of the ground state structure will be preferred; if a
              ground state can not be found for a composition, the convex hull
              energy will be used with a warning message.
  
          Returns:
              list: list of dicts of form {ratio,energy,rxn} where `ratio` is the
                  reactant mixing ratio, `energy` is the reaction energy
                  in eV/atom, and `rxn` is a
                  `pymatgen.analysis.reaction_calculator.Reaction`.