Integrating API key into n8n project

[LeoTR]

Hello, I want to do a project with n8n. My goal is that the member asks a question on the telegram bot and searches for the answer on the website and answers the member. This answer includes the link to the topic they want. This makes it easier for the member to find the topic and link they want. However, I'm stuck on the api key part. How can I implement the api key in n8n? Is there an example for this?
Integrating API key into n8n project

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