- Most debit cards do not work on Amazon, however credit cards work 100% of the time. (I am using SCB CC)
- When you are buying from Amazon, usually a third party is selling the item. But you have to see who is shipping the item, 80% items are being shipped directly by Amazon. (See for "Fulfilled by Amazon" sign)
Duty is very complicated, when you are using shipito, they ask you to fill a digital custom form. In that form you can mention the exact HS code of the item and lower valuation. (Search for HS code on Google)
Don't value your item below $100 if its a $200 item. Custom guys will not hold your items unless it needs a license to import, for example you need a license to import tablets.
Computer, phones, electronics, car products etc are fine, go through FBR website to check for specific regulations.
Interesting story: Once customs blocked my tablet shipment (1 piece only) they asked for license and stuff, I went straight to the director's office, explained him my situation and he was kind enough to release the item against 2,000 duty.