I hope that my topic is properly located here. I am currently creating a shop for my product and have the following challenge in my process:
The products I offer are limited to 750 pieces. They consist of two parts. The customer receives one directly with the purchase, the other after two weeks. For the second part, the customer should receive a link where he can purchase the product in its basic version once or get a larger version of this product via an upgrade.
My challenge: How can I ensure that only the person who bought the first part has access to the second part and only buys one product?
Is there an app for this?
I'm really looking forward to going live with the shop and hope you can help me with my challenge.