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What would be 'the best' method in my case? And which payment should I use for it?

If the Item Is extremely light (< 120 grams), the missing Item method will suffice.

In terms of the payment system, If the SE fails, PayPal allows you to file a dispute/claim with the Intention to reverse the transaction.

Thank you for all replies! I'll order a single item at first and try to DNA them. When I see how they react, I might order more items at once in the future!