SKU number change for returning client

@dimijazz to clarify:
– do users need to create accounts on your site in order to complete an order?
— if not, then this becomes rather hard

– is this for the first time they place an order (so when they first create their account), or for the first time they purchase any individual product (so if they came on Sept 1st and purchased product A they should get it, if they came on Sept 3rd and purchased product B they should get it, but if they came back on Sept 7th and purchased A again they shouldn’t get it).

– is this for the order email only or for elsewhere in the system? Are you trying to connect with a third party system for this?

You’re more than likely going to need to do a custom built solution for this.

Hi Anphira and thanks alot for the comment.

Users need to create account in the checkout page
It is for the first time the purchase a product.
If the purchased it on sept 9th for the first time they get it and the logistic center gets an SKU like A2210-1. If the come again in Sepy 20 and buy it again they get it and the logistic center through API gets an SKU A2210.
This has to do that in the first order the logistic center adds 2 more gift SKU in the package.
Also I would like too mention that one product is subscription based (woo subscriptions plugin). So the system auto completes the order.

And we have only 2 product: 1 regular and one subscription.
Any help would be wonderful.
Thanks alot.
Dimitris