The discount amount depends on the balance of the wallet you connect in. It's agreed in advance, and the buyer knows in advance its size.
Your Personal Discount token is:
Valid on orders of $100 or more
Valid on orders of $1000 or more + free shipping
Valid on orders of $500 or more + free shipping
To get a bonus you just need to choose the desired amount of discount from the proposed list, connect any wallet by pressing the 'Connect' button, after successful connection press the 'Claim' button.