Help with cash collect issues

If your custom e-commerce checkout is structured with a fast HTTPS frontend but relies on a localized backend to catch transaction data, you have likely run into CORS or Mixed Content security blocks. Your browser actively prevents secure client-side fetch requests from hitting raw unencrypted backend ports, severing your tracking pipeline.

Instead of deploying bloated SSL certificates across all your internal daemons, use your existing Nginx web server as an armored tunnel.

By dropping this proxy block into your /etc/nginx/sites-enabled/ configuration, you instantly bypass Corsair rejections and securely funnel the traffic:

location /api/webhook/ {
    proxy_pass http://127.0.0.1:5000/webhook/;
    proxy_set_header Host $host;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-Proto $scheme;

    if ($request_method = 'OPTIONS') {
        add_header 'Access-Control-Allow-Origin' '*';
        add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
        add_header 'Access-Control-Max-Age' 1728000;
        add_header 'Content-Type' 'text/plain';
        return 204;
    }
}

Your frontend Javascript can now ignore raw IP addresses entirely and route cleanly through your existing secure domain certificate:

fetch('https://yourdomain.com/api/webhook/paypal', { method: 'POST' })

Behind the Nginx interceptor, your lightweight Python Flask daemon is able to catch the payload on Port 5000, completely insulated from the public internet.

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