nginx: client address headers only from $remote_addr (realip). X-Forwarded-For was appended to and CF-Connecting-IP passed through from the client, so a request reaching the origin without Cloudflare (DNS-only host or the bare IP) chose the address the service bans and rate-limits by

ddiff --git a/deploy/nginx/billing.openvibe.network.conf b/deploy/nginx/billing.openvibe.network.conf
iindex 7bfd1b2..f27d638 100644
---- a/deploy/nginx/billing.openvibe.network.conf
++++ b/deploy/nginx/billing.openvibe.network.conf
@@@ -43,8 +43,9 @@ server {
      add_header X-Robots-Tag "noindex, nofollow" always;
  
      proxy_set_header Host              $host;
--    proxy_set_header X-Real-IP         $remote_addr;
--    proxy_set_header X-Forwarded-For   $proxy_add_x_forwarded_for;
++    proxy_set_header X-Real-IP $remote_addr;
++    proxy_set_header X-Forwarded-For $remote_addr;
++    proxy_set_header CF-Connecting-IP $remote_addr;
      proxy_set_header X-Forwarded-Proto $scheme;
      proxy_http_version 1.1;