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What should I know before adding special instructions to an order note?

Check for conflicts between your note and the chosen configuration. Base your expectations on instructions the seller has actually accepted.

How can I get useful help from the seller about a product or order?

If reporting a problem, describe what happened rather than only saying it does not work. Avoid sending unrelated personal information with a product inquiry.

What should I clarify if I need more time to decide on an offer?

Ask whether a fresh offer can be requested after expiry. Avoid sending repeated extension requests through several channels at once.