Buyers from Indonesia

Just had a guy from Indonesia buy a $400 card, which is a first for me. Is there any way to complete the transaction without getting scammed, or should I just cancel it altogether?
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Might double check and ask about this customs intervention.
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These two are PayPal compliant.
Indonesia is Zone 6. Should be under $40, including the extra insurance.
Global Express Guaranteed® Average 1-3 business days From $35.50 Prices based on weight, size and distance.
Express Mail International® Average 3 - 5 business days From $26.95 Prices based on weight and distance.
Flat-rate envelope available.
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I like EMI, but I have not tried it to Indonesia. It
works great to Canada.