Where can I see the DJI drone purchase voucher?

On DJI official website. The proof of purchase is the proof of the goods you bought. The purchase voucher of DJI UAV can be found on the official website of DJI. DJI UAV is an aerial survey UAV, equipped with an integrated multi-spectral imaging system, which can collect high-precision multi-spectral data and help to complete agricultural monitoring and environmental monitoring efficiently.