If you are using a google account you are able to add a Google Site Key to your webstore. 


This can be done on the webstore control panel - by going to System > Settings > Google Intergration > Register for a Google Site Key. 



Upon clicking on Register Here you should be taken to the following page, where you will need to give it a label (doesn’t matter what this is but for ease put the domain) then in the domain section add in the web store domain and finally in the project put something like Webstore Captcha. Please make sure the V3 captcha option is selected and then when you then submit it should give you an API key, to put into the webstore control panel.