The Zend_Captcha_ReCaptcha adapter uses Zend_Service_ReCaptcha
to generate and validate CAPTCHAs. It exposes the following
methods:
setPrivKey($key)andgetPrivKey()allow you to specify the private key to use for the ReCaptcha service. This must be specified during construction, although it may be overridden at any point.setPubKey($key)andgetPubKey()allow you to specify the public key to use with the ReCaptcha service. This must be specified during construction, although it may be overridden at any point.setService(Zend_Service_ReCaptcha $service)andgetService()allow you to set and get the ReCaptcha service object.