It is mandatory to set up your google reCAPTCHA v2 api key to work of your register page. follow below step to get you own captcha key.
Step 01: click on v2 Admin Console to go admin console
Step 02: Register a new site
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Step 03: enter label for recognise it later
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Step 04: select reCAPTCHA type to reCAPTCHA v2
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Step 05: enter your Domains
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Step 06: add Owners
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Step 07: Accept the reCAPTCHA Terms of Service
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Step 08: click on submit button, Your API keys will be generated.
generated google captcha v3 api key Step 09: Now you have to add those captcha keys to admin panel “Page Settings->Register Recaptcha Settings”
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Google Captcha V2 Site Key: copy google captcha v2 site key and paste it here
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Google Captcha V2 Secret Key: copy google captcha v2 secret key and paste it here