When you join the guild you may select 3 items which will be added to the accepted payments list, when ever an order comes in and the customer wants to pay with your selected items you have first option to fufil this order and keep 100% of the payment. You can also opt to share the order with another member of the guild. You will need to agree a percentage split with the guild member.
For example I split an order of 100 sheet glass with a guild member at 60/40 I make 60 sheetglass and keep 60% of payment.
If the customer selects your items as their payment method and you dont want to fufil the order or share the order will go to the first person to bid for it.
If you choose an item that is already been selected by another member any orders paid by the said items will designated to whoever bids for the order first.