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How accounts are identified
Send your API key as code on every call. That is how PagePeeker knows the request is yours.
Your code
Find your API key in your account. viewport and agent only take effect on requests with a code.
WarningKeep your code on your server. Anyone who copies it can spend your monthly API calls.
When there is no match
thumbs.php returns a "Thumbnail not available" image, and the reason is in the headers. See Errors.
Requests without a code
A request with no code is matched by the domain in its Referer header, against the sites in your account. Image URLs already in web pages work this way, and they keep working.