Problems with CoinPayments IPN

Hi there.
I’m have a problem with integration of CoinPayments IPN to backend. In localhost all working fine (i’m testing with ngrok), but on production, incoming requests to my IPN endpoint getting 403 forbidden (ipn url i setted correctly in coinpayments). I’m using cloudflare, application was deployed to digital ocean droplet. I’m checking logs of ngingx (/nginx/access.log) - [29/May/2024:12:36:06 +0000] “POST /api/v1/payments/ipn HTTP/1.1” 403 41 “-” “ IPN Generator”.
How can i fix it?