To build a form with reCaptcha validation, you need to add API key pair to the site setting.
STEP-BY-STEP
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1Go to the site settings management in admin: Settings > Site Settings
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2Search reCaptcha configuration on the site setting grid
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3Click Edit icon to update your API key pair
Note: in order to get the Public and Private Keys, you can refer to Sign Up for an API Key Pair for Your Site
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4Click Save