How do I generate unique order numbers in my form?

I am looking to put together a Purchase Order form for some merchandise my club are looking to sell to parents etc.

I have previewed the form and filled in an example with details etc.

But the "Buyer" doesn't seem to be provided with an order number?

The confirmation email the admin gets is just a straight forward copy of the form?

Thanks

You can use Unique ID widget that will give you some random number that you can use as Order number:

Or Random Value Generator Widget that will do the similar, but you have more options to adjust:

Hope it helps. 

If you have any further questions please let us know.

Thank you!