Discount Prime empowers Shopify store owners to create quantity and volume discount campaigns with multiple tiers. This documentation provides a detailed guide on efficiently applying tier-based volume and quantity discounts to customers’ carts.

You can create and run unlimited Volume and Quantity campaigns with multiple tiers using Discount Prime. For each campaign, you can select a discount type (percentage or amount), and for each tier, you can set different discount values (e.g. buy 2 items, get 10% off.)

If you select “ All items in the cart together,” the discounts are applied to all products in an active campaign and the cart. However, if you select “Each item in the cart independently,” we calculate the discount amount for each product in the cart separately.

In this section, we want to describe the availabilities, Shopify's limitations, and the method that we use to apply your discount to the customers’ carts with an example.

Imagine a store owner running 3 quantity campaigns (Q1, Q2, Q3) and 2 volume campaigns (V1, V2) on different products. A customer adds 7 different products, contained in different campaigns, to their cart (P1, P2, P3, P4, P5, P6, P7). You can see the details of campaigns and products in the table below.

In the example, there are 7 products in the cart, each contained in a campaign. Based on the count of items that the customer adds to the cart and the specific tier, the discount amount is calculated.

As you see in the image below, the discount value and type of the 2nd tier of the Q1 campaign is equal to the 1st tier of the Q2 campaign. Both are 20%.

When we want to apply the discounts to the cart, we can send up to 4 different tier categories to Shopify due to Shopify’s limitations. If any two tiers have equal discount value and type (e.g. 20%), we put them in one category.

In the example, we have 6 different categories because the discount value and type of the 2nd tier of the Q1 campaign is equal to the 1st tier of the Q2 campaign. Both are 20%.

The discount amount of a category is the sum of discount amounts of any equal tiers in this category (in the example, the sum of discount amounts is $20+$40=$60).

Then we sort the Discount amounts from the highest to lowest (in the example, from $150 to $20.)

As you see in the image above, the four highest categories' discount amounts are applied to the cart, but the two remaining categories' discount amounts are not applied to the cart. It means the discounts of products P7 and P4 are not applied, and they are calculated at their actual prices ($700, $400). The ultimate result is displayed below: