In my personal experience it seems that Amazon doesn't bother users again for quite a while once they answer a captcha, as long as cookies are maintained.
Perhaps a solution would be to present the captcha to the user for solution, proving the non-botness of the requester along with preserving the Amazon cookies in a more permanent fashion.
ETA: The function of making a request to Amazon and having the user solve the captcha could be a UI plugin, separate from the Amazon metadata plugin, as long as they share cookies.
Last edited by jhowell; 02-28-2017 at 12:25 PM.
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