Why not use an Escrow company like Escrow.com.
Buyer and Seller Agree to Terms
Both parties agree to terms of the transaction, which includes a description of the merchandise, sale price, number of days for the Buyer's inspection, and any shipping information.
Buyer Pays Escrow.com
The Buyer submits an available payment option. Escrow.com verifies the payment. Processing time varies by payment method.
Seller Ships Merchandise
Upon payment verification, the Seller is authorized to ship merchandise and submit tracking information. Escrow.com verifies that the Buyer receives the shipment.
Buyer Accepts the Merchandise
The Buyer has a set number of days for an inspection and the option to accept or reject the merchandise. For more information, FAQs - Return Questions.
Escrow.com Pays the Seller
Escrow.com pays the Seller by the method selected by the Seller. The transaction is complete.
For something like this, its the only way to go.