Connecting API to without Api connector tool?

Is it possible to bypass it? I was given an assignment to create an API and connect it to my bubble project.

The whole process should look something like this:
a. Data is entered and sent to the Bubble in-built plugin you created on button
b. The Bubble in-built plugin sends the data over to an outside API you created.
c. The outside API should do the operations and return the parsed string back to
the Bubble in-built plugin.
d. Data is returned from the built-in plugin back to the Bubble app for the user to

As I understand, I cannot use the 3d party API. I have to create it on on my own. Now let’s say that I created API in python language, how do I connect it without using API CONNECTOR.