Possible to create X for XX discount with discount code?

Extensions
1

Hi, we have various Shopify functions running to create an x for xx discount, i.e. 2 for $25 based on product tags, with custom messages to tell customers to add an item to get full discount, and discount only quantities of two. We also have that for a 3 for $39 etc.

What we would want to do is offer this discount at Checkout based on a discount code. Is this possible using Checkout Extension with cart lines:

And with Discounts api:

I.E. check to see if discount code is applied, then discount multiples of two, message customer to add one if qualifying products based on tags are even, etc. ?

The idea is to send a code to our most select customers so only they get the discount, not every customer.

Edited to add, the products that would be eligible for a 2 for XX discount etc. could all have different prices, so I would need to do something like this for non-even quantities:

 const targets = input.cart.lines
    // Only include cart lines with a quantity of two or more
    .filter((line) =>  line.merchandise.__typename == "ProductVariant" && line.merchandise.product.two_for_tag == true)
    .map((line) => {
      return /** @type {Target} */ ({
        // Use the cart line ID to create a discount target
        cartLine: {
          id: line.id,
        },
        lineitemPrice: line.cost.amountPerQuantity.amount,
        lineitemQty: line.quantity,
        
      });
    });

<snip>


// below is code fragment for non-even qualifying quantities
var obj = new Object();
        obj.targets = [{ cartLine: value.cartLine}] ;

        var temp_discount = ( (parseFloat(value.lineitemPrice).toFixed(2) - 12.50) * ( value.lineitemQty - 1) ).toFixed(2);
        //num.toLocaleString('en-US', {minimumFractionDigits: 8, useGrouping: false})
        var temp_discount_str = temp_discount.toLocaleString('en-US', {minimumFractionDigits: 2, useGrouping: false});
        obj.message = "Add one more to get full discount!";
        obj.value = { "fixedAmount": {amount: temp_discount_str}};
        
        customDiscount.discounts.push(obj);
<snip>

Thanks!

2

Hi @Floyd_Wallace,

I’m not certain I’m following you entirely, but using the Checkout UI extensions API, it is possible to read discount codes currently applied to a checkout, and to apply new discount codes. However, you cannot use the API to customize the behaviour of a discount code.

You can similarly use the Cart Lines API to add a cart line, or update a line quantity, but you cannot modify the price of cart lines.

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