I have an interesting situation. I have set up a small shopping cart for a natural history society www.tongariro.org.nz with items available at different prices for members and non members.
To avoid non members taking advantage of the members special pricing is there a way that members can enter their membership number when they order. I dont think the sales are that great that we need database checking and confirmation of the number but it may help those administering the shop to weed out the non members - its a bit of bluff really!

Thanks
Dave