Question

developer
consumer
api key
hes the description.
programmer who will use an api into their program
creator of the application program interface for use by other programmers
a way to give/receive permission to use an api

Explanation:

A consumer is a programmer who integrates an API into their program. A developer creates the API for others to use. An API key manages permission for API use.

Answer:

consumer: programmer who will use an API into their program
developer: creator of the Application Program Interface for use by other programmers
API key: a way to give/receive permission to use an API