(Use Case) Limit Quantity to Multiples of 4

This is a configuration example for restricting purchases to set quantity increments, such as bouquets of flowers sold only in units of 4.

Use case

Use this when you want to sell products only in specific bundle units — for example, products like bouquets where the quantity itself is meaningful. Customers can select quantities starting from 1 on the product page, but only multiples of 4 are accepted per order.

Result

When customers add the eligible items to their cart (or attempt to purchase), the following behavior applies based on quantity:

Multiples of 4 (4, 8, 12, 16, … items) → Allowed
Non-multiples of 4 (1, 2, 3, 5, … items) → Not allowed

Configuration example

Field	Value
① Title	Enter any title
② Limit details > Minimum quantity	4
② Limit details > Maximum quantity	(Not set)
② Limit details > Increment	4
② Limit details > Applicability	Variant
③ Eligible items	Set the products you want to restrict
④ Product message	Enter any message
⑤ Alert message > Display timing	Checkout only
⑤ Alert message > Minimum quantity message	Enter any message
⑤ Alert message > Increment message	Enter any message

Configuration tips

Setting Increment to 4 displays an error at checkout when customers attempt to purchase a quantity that is not a multiple of 4.
The restriction check may not work correctly on the cart page. We recommend setting the alert message Display timing to Checkout only.
Using {{increment}} in the Increment message dynamically displays the increment value (4) within the error message.