Hello, my sibling has signed up for UNIDAYS so we can use it to purchase apple products with cheaper price, I wanna ask if the student who has signed up for unidays do they need to be present in store while purchasing products or can we just sign in into their unidays account on the browser to let them verify without the person's presence? (I have their student card copy just in case too)

**Note, my sibling might have returned to their uni to study and won't be present in the store ill be visiting

And where do I check the purchase limit for each products which are eligible for unidays education price? Thank you in advance.