If you are using Prestashop 1.7 or 8 version, please use our Google reCAPTCHA module. 

On Google reCAPTCHA site, create public key a private key (to enter it into the module).

On the beginning, choose "Switch to legacy key". 

On the same screen, fill following fields:
- "Label" - you can fill name of your web or other description
- "Domain" - fill your domain name without www (e.g. test.com)

After submitting the form, you will see two keys - Public and Private. Fill it in the configuration form of our module.