Here's the diff for subscribe.php to require captcha for all list adds: https://pastebin.com/tSLkvYME https://pastebin.com/tSLkvYME if you need API support, yo

Here's the diff for subscribe.php to require captcha for all list adds: https://pastebin.com/tSLkvYME https://pastebin.com/tSLkvYME if you need API support, you could use captcha_passed = verify_api_key($api_key) and include the api_key in the post request