我有一个Nginx，我需要允许访问特定URL的特定方法，更重要的是，这些URL包含正则表达式。
具体要求如下：

/bill/<SOME_NUMBER_THAT_CHANGES>/verify --> GET & POST only

/bill/ipn/<SOME_STRING_THAT_CHANGES> --> POST only

我目前无法使用的配置如下：

server {
    server_name             foo.example.com;

    location ~ ^/bill/([0-9]+)/verify { 
        limit_except GET POST {
           deny all;
        }
        proxy_pass http://app:<PORT>/$1;
        proxy_set_header X-Real-IP $remote_addr;
    }

    location ~ ^/bill/ipn/([A-Za-z0-9]+) { 
        limit_except POST {
           deny all;
        }
        proxy_pass http://app:<PORT>/$1;
        proxy_set_header X-Real-IP $remote_addr;
    }

    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/foo.example.com/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/foo.example.com/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot
}

例如，每当我尝试curlfoo.example.com/bill/540/verify时，它都会返回404 not found。
我已经使用以下链接创建了上述配置：

• "proxy_pass" cannot have URI part in location given by regular expression
• Nginx只允许特定URL的POST请求
• https://nginx.org/en/docs/http/ngx_http_core_module.html#limit_except

问：你知道如何实现这一点吗？
任何帮助都是感激不尽的，提前表示感谢。