I've created a custom bot and activated the default "Incoming Webhook Handler" code.

Then I tried to send a POST on its "Incoming Webhook Endpoint" (something like this: https://cliq.zoho.eu/api/v2/bots/{bot-name}/incoming) and appended the token I created from "Webhook Tokens" section (something like this: NNNN.XXXXXX.YYYYYY) to its "Authorization" header, with "Zoho-oauthtoken" prefix and a space after it

I also set the Content-Type to application/json,

but the only thing I always receive is "HTTP Status 401 – Unauthorized"