Block specific URLs calls, with a delay

Hello everyone,
During recent weeks, after it was slightly modified, somehow my application spread over torrents ( I think )… The application calls our server API to check for a valid license (an HTTPS call ).
Now, my server is bombarded with such checks, which are supposed to occur once every few days. Instead is invoked on every operation call, within the app.

I managed to block all such traffic using the Cloudflare Firewall. But I wonder if there is a way to add a delayed response on such calls? Tried to do that on my server, but the number of calls is too high for my Apache, so it ends using all server memory.

Thanks

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