If PayPal keeps hitting your IPN page, it indicates that your script is giving them a server error. Please check your server error logs to see if your IPN script is giving a server error.
PayPal needs an HTTP 200OK response from your webserver. It does not care about verified or any other response from you, it simply needs a 200OK server response and that happens when they hit your IPN page and no script error is given.
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Shannon @
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