What is Webhook's Secret Token and how do we set on in n8n?

I have a service that is asking to hash the token with webhook’s secret token and I don’t know how to get that webhook’s secret token that n8n uses. How do I get one?

Can any one help please?

Can you please share that documentation.

Generally does n8n not have anything like a secret token. External services may have them, and the user would then have to create a trigger node or workflow which validates it.