How can I get my visitors IDs for tax reasons?

Carmen878
Level 1
New York, United States

How can I get my visitors IDs for tax reasons?

I have been requesting guests ID info in spain for a while, but in order to file my taxes for the previous year, i need some IDs info from days when I didnt ask my guests for it. 

Any idea on how can I get these? 

Thank you! 

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