That is up to you. It depends on whether you want to identify yourself as one party when you provide information, or as several parties. If you send product information from one GLN, you will be charged for one Validoo Supplier agreement. If you choose to create more GLNs to send from, there will be a Validoo Supplier fee for each GLN. There is also an option in the trade item information to display different GLNs to distinguish which order GLN the trade item information refers to. You then use T3788 Party role code and the code value PURCHASE_ORDER_RECEIVER for this.