Use the optional inputs to document your API keys if you prefer.
Why would I document API keys in Avo?
Documenting the API keys in Avo allows you to have a single source of truth for which API keys should be used for every destination in every environment, avoiding wrong or invalid API keys from being used in your sources.
API Keys in Avo Functions
API keys are not required when using Destination Interface.
If the keys are documented in Avo they will be passed into the make callback of the Destination Interface in Avo Functions, where you can initialize your destinations using the API keys.
You are still required to provide the keys when using legacy Avo managed destinations.