HeY @IPalSeb! I haven’t had a chance to test this to see how/if it works on a completely custom form, but you can check out Shopify’s documentation on how to attach hCAPTCHA to a form: https://shopify.dev/docs/storefronts/themes/trust-security/captcha#advanced-forcing-captcha-wire-up-to-a-form
Hope that helps 
Hello @Brett !
Thank you for your response.
I tried that, but I’m not sure if I did it correctly.
I added data-shopify-captcha="true" to the form tag, but it didn’t seem to help.
Could I be missing something?
Thank you!
This question is not related to Shopify Functions. Please repost in an appropriate topic. Online store perhaps?