Error freekassa

Hello, I have a problem. I use as a payment service FreeKassa.ru, after connecting to my site of your protection-stopped working with an error when replenishing the balance on the site Hacking Attempt!. I added the IP of the Free Kassa service to your firewall, but still nothing has changed. The error remained the same.
LOG FREEKASSA :

Server: cloudflare
    CF-RAY: 610fe36fcb3b4131-PRG

    hacking attempt!

HTTP/1.1 200 OK
Date: Wed, 13 Jan 2021 14:43:14 GMT
Content-Type: text/html; charset=UTF-8
Transfer-Encoding: chunked
Connection: keep-alive
Set-Cookie: __cfduid=d559e4283b7a6b9482923cb2df4df71651610548994; expires=Fri, 12-Feb-21 14:43:14 GMT; path=/; domain=.enotixru; HttpOnly; SameSite=Lax; Secure
CF-Cache-Status: DYNAMIC
cf-request-id: 079dcc79e000004131a782d000000001
Expect-CT: max-age=604800, report-uri=“https://report-uricloudflarecom/cdn-cgi/beacon/expect-ct
Report-To: {“endpoints”:[{“url”:“https://anelcloudflarecom/report?s=2Ky5jIe%2FQoucvG0BoDwDcevxnGjC8x6mEU40Mftya8OVUsu9NdEHjmCCtMLy1%2FkegRAe0uapTuMIQt9S33reT%2Futw5DFtruWgnc%3D"}],“group”:“cf-nel”,"max_age”:604800}
NEL: {“report_to”:“cf-nel”,“max_age”:604800}
Server: cloudflare
CF-RAY: 610fe36fcb3b4131-PRG

hacking attempt!