Build and Deploy

1. Build the production version.
2. Upload everything inside build/web to the website's domain folder.
3. Add a rewrite rule so deep links open the app instead of a 404 page.

flutter build web --release

Apache rewrite rule (.htaccess)

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^ index.html [L]

After uploading, open the site in a private window to avoid a cached older version, then place a test order.