We can enable/disable collect coupons or not when we create a one-time or recurring payment button. As a pre-condition, we need to create these coupons on the stripe dashboard side and then send an email to share with your client to use. Refer to https://dashboard.stripe.com/coupons/create
Using FIRST50 as coupon code during check out page
Click to copy the card number or use any of our our test cards. Use any future expiration date and three-number CVC.