iPhone invoice

If you bought your iPhone at Apple Online Shop, see the section "View or Print Invoice" in this support article:--> Viewing & Changing Orders - Shopping Help - Apple ,or contact Apple directly using this link:--> Contact Apple for support and service

In all other circumstances (Apple phisycal Stores, Authorized Resellers, who have their own accounting system) contact the seller and ask for a copy of that document.

Regards

Giulio

Contact the Store where you puchased the iPhone.

No one here can send you the invoice, we are also users of Apple products & services like you. 

Then contact the Apple Store UAE.