Im developing a website. On my local pc, every exterior connection my API makes with other services works. But on the production server, many POST requests start to fail. In this case its Google’s reCaptcha.
All the Google reCAPTCHA variants will work with Cloudflare in front of your domain, sure. Just make sure you don’t have any kind of security in place in your Cloudflare setup that is preventing the client doing the POST directly to where you’re processing the result.