http://www.globalblue.cn/customer-services/tax-free-shopping/tax-free-shopping-faqs/
http://www.adr.it/documents/10157/6272163/T1+Partenze.pdf/1ab1a4d1-9241-4285-8e34-6553c6fa74cd
http://www.adr.it/documents/10157/6272163/T2.pdf/f25713d3-95ee-4bc2-b377-603108bbb6e5
http://www.adr.it/documents/10157/6272163/T3+Partenze.pdf/eea2352a-f58d-4e55-a2bd-8a0bce089188
http://www.adr.it/documents/10157/6272163/T5.pdf/e8142622-fc96-4f8f-bad1-d45c8067e52d
http://www.adr.it/web/aeroporti-di-roma-en-/fiumicino-pdf-shopping-maps
Two methods for getting your tax refund processed at Rome Fiumicino Airport:
Option 1:
If you are hand-carrying your purchases, it’s easier to do your airline check-in and then go straight through passport and security control first. Just after the passport control there is a Customs Desk where you can get your Tax refund form stamped. Next door to the Customs office are the Global Blue and Premier Tax Free desks where you can have your VAT refundpaid in cash or credited to your credit card. Not many people are aware of this option.
Option 2:
If you’ve done a lot of shopping and wish to pack your shopping into your checked-in baggage, the process is as follows:
You must first do your airline check-in and obtain your boarding pass. VAT Refund can only be processed at your final point of departure from the EU and your boarding pass provides evidence of your next destination. Advise the airline check-in personnel that you’d like your luggage back as you need to do your VAT refund.

记得意大利有一个退税官网，百度一下看看吧。还有意大利的罗马和米兰是有支付宝的退税通道的，你也可以咨询一下支付宝。

The Mall能直接在Outlet退