How it works
Buy & Sell Second‑Hand Items Easily on postdii.com in Just a Few Steps
For Buyers
1. Find Products
Browse items on the Marketplace page or search by category. All items are posted by sellers who have completed identity verification.
2. Chat with the Seller
Click “Chat with Seller” on the product page to ask questions, negotiate prices, and agree on purchase terms.
3. Order Online (Escrow System — for buyers who prefer shipping and want protection from scams)
Postdii acts as a trusted middleman to ensure safe transactions.
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Once the buyer receives and checks the item,
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Only then will the seller receive the payment.
This helps prevent fraud and increases confidence for both sides.
How it works:
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After agreeing on a price, the seller will confirm the final price in chat.
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The system will automatically calculate the service fee.
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Then you can:
Click “Pay Now” to pay via Stripe (Credit Card / PromptPay).
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Your money will be held in Escrow, not released to the seller yet.
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⏰ Payment must be made within 24 hours, otherwise the order will be automatically canceled.
4. Wait for Delivery
The seller ships the item and provides a tracking number so you can follow the shipment.
5. Confirm Receipt
Once you receive the item, click “Confirm Received” in the chat. The system will then release the payment to the seller immediately.
For Sellers
1. List Your Item
Click “+ Sell”, take photos, add details, set a price, and choose delivery options (Shipping / Meet‑up / Online Order).
2. Wait for Buyers to Contact You
Interested buyers will message you. Answer questions and negotiate the price.
3. Confirm Final Price
(For transactions where the buyer pays the service fee to ensure safe delivery and product accuracy)
Once both parties agree, click “Confirm Price” in the chat and enter the agreed amount. The system will automatically create an order.
4. Ship the Item
After the buyer makes the payment, click “Mark as Shipped” and enter the tracking number.
5. Get Paid
Once the buyer confirms receipt, the payment (minus service fees) will be added to your Wallet automatically.
What Is the Escrow System?
Escrow is a secure payment‑holding system that protects both buyers and sellers:
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Buyer pays → Money is held in Escrow
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Seller ships → Buyer receives tracking number
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Buyer confirms receipt → Money is released to the seller
This ensures buyers receive their items and sellers receive their payments.
Fees
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Service fees are added on top of the item price (paid by the buyer).
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Sellers receive the full agreed amount (no deductions).
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If you want to cancel an unpaid order, you can cancel anytime.
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If payment has already been made, the seller can cancel and the system will refund the buyer automatically.
Track Your Orders
You can view all order statuses under “My Orders” — both as a buyer and a seller.