A "method" is a common term that means a procedure or function for getting something done.
You can exchange Attribute data using a Method without creating an API Trigger.
Conversely, you do not need to create a Method if you only wish to trigger Conducttr and not exchange Attribute data.
To create a Method, navigate to the API panel, create or open the API and then select the "API Method" page, click + to add a new Method
You give your Method any name you wish.