How to get a copy of my Apple Watch bill?
I need a bill of my apple watch which i have lost the bill
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If you ordered online form Apple, you can log into your account and print it again:
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Once an item is shipped or picked up, Apple will create an invoice for your order. To view or print your invoice, go to your Order Listing page and select an item to go to the order details. Then, select View Invoice at the top of your order details page to access your invoice.
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copied from: Viewing & Changing Orders - Shopping Help - Apple
Or give the official Apple Support a call: