My question is, how unique is the incremental order Id? The payment gateway I'm using requires a unique order Id for every purchase attempt.
So let's say customer A tries to purchase, but his transaction is denied.
Order ID: 1,
Increment Order ID: 100001
When he tries to purchase again, will the
Increment Order Id become
100002, or will it still be
100001? And if so, how do I refresh/increment it?
Also, will it be unique across customers? Will an
Order ID: 2 have an
Increment Order ID: 100001? Or will it be unique across all orders?