How many reviews can I collect with Popcard?
Popcard is not limited on the number of reviews you can collect.
So the answer is: Infinite number of reviews!
Can I change the link on my Popcard?
No, there is no possibility to change the link.
You will have to recommend another card with the new link
What is the validity period of Popcard ?
Once you get your Popcard it is valid for life!