6. After final purchase price has been calculated and confirmed by Bullion Bank Officers, then Seller’s Bank officer shall issue an Invitation Letter as Appendix B stated with banking responsibility for the confirmation of product in the amount of 200MT of AU Metal, to invite Buyer into the HSBC, Hong Kong Main Office for verification the copy of SKR, after successful verification, then Buyer shall block his fund for guarantee the payment of 200MT of AU Metal by the agreement as per Transaction Code………… Upon receiving the said Invitation Letter, Buyer shall sign for the acknowledgement.