SagepayがNginxのCartthrob通知URLに連絡しようとすると404

次の設定を試してください：

server {
  listen 443 default_server ssl;
  ssl_certificate /etc/nginx/ssl/xxx_xxx_xxx.pem;
  ssl_certificate_key /etc/nginx/ssl/xxx_xxx_xxx.key;
  server_name xxx.xxx.xxx;
  root /sites/xxx_xxx_xxx/public_html;

  access_log /var/log/nginx/xxx_xxx_xxx-access.log;
  error_log  /var/log/nginx/xxx_xxx_xxx-error.log info;

  location /themes/third_party/cartthrob/lib/extload.php { 
    rewrite ^(.*) /themes/third_party/cartthrob/lib/extload.php?$1 last; 
  }

  location/{
    index index.php;
    try_files $uri $uri/ @ee;
  }

  location @ee {
    rewrite ^(.*) /index.php?$1 last;
  }

  location ~ \.php$ {
    include /etc/nginx/fastcgi_params;
    fastcgi_pass unix:/var/run/php5-fpm.sock;
    fastcgi_index index.php5;
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
  }
}