Dropshipping/ Got email customer needs 1000-2000 items! [HELP]

Fenix19 said:

How i can know he is not scammer?
How much i should ask upfront payment?
Which payment provider i should choose so i can be safe?
He is from portugal or brazil and he is doing export import...

Click to expand...

1. Do you have registered business?
2. Does your buyer physical person or entity?
3. Can you use ESCROW payment?

Remember the main rule: money first, goods/services next, especially if we're talking about international transactions.