How can i override core api interface in my custom module

Question

i am trying to override model and interface of core api in to my custom module for adding new data but i am not able to override interface to add that data contract.

Answer 1

Classes in PHP can implement many interfaces at once. Your best bet is to write your own interface which adds the methods you require, then implement the models you want to implement the interfaces you need.

The interface

interface MyCustomManagementInterface
{
    public myMethod();
}

The Class

class MyCustomClass implements \Magento\Framework\Some\Interface,
    MyCustomManagementInterface
{
}