In Shopify, I used the Function API to implement discounts on the website. However, I found that after implementing the discount, users are unable to use a code to stack discounts at the checkout page.
The one that takes effect is the greater discount. For example, if the discount a user can get through the Function API is $100, and the discount using a code is $200, then the discount from the code will be applied. Conversely, if the discount from the code is less than the discount calculated by the Function API, then the discount from the Function API will be applied.
Only one of the two discounts can be applied. Can anyone help with this issue?
If I change the discount to 85%, then the code will be applied.
Below is my code:
/**
* @description
* Ekko
* 2024-06-26
*/
// -check
import { DiscountApplicationStrategy } from "../generated/api";
/**
* @typedef {import("../generated/api").RunInput} RunInput
* @typedef {import("../generated/api").FunctionRunResult} FunctionRunResult
* @typedef {import("../generated/api").Target} Target
* @typedef {import("../generated/api").ProductVariant} ProductVariant
*/
/**
* {FunctionRunResult}
*/
const EMPTY_DISCOUNT = {
discountApplicationStrategy: DiscountApplicationStrategy.First,
discounts: [],
};
/**
* {RunInput} input
* @returns {FunctionRunResult}
*/
export function run(input) {
console.log('input', JSON.stringify(input));
const threshold = 1000; // Set your threshold amount here
const giftProductId = "gid://shopify/ProductVariant/45838797930812"; // Set the product variant ID for the gift product
let cartTotal = input.cart.cost.totalAmount.amount;
console.log('cartTotal', cartTotal);
let giftLine = null;
// Calculate the cart total excluding the gift product
input.cart.lines.forEach(line => {
if (line.merchandise.__typename == "ProductVariant") {
if (line.merchandise.id == giftProductId) {
giftLine = line;
}
}
});
console.log('giftLine', JSON.stringify(giftLine))
if (giftLine) {
cartTotal = cartTotal - 600 // Assuming variant.price exists and is the price of the product
}
console.log('cartTotal', cartTotal);
// Check if the cart total meets the threshold
if (cartTotal >= threshold && giftLine) {
const discount = {
targets: [
{
productVariant: {
id: giftProductId,
quantity: 1
},
},
],
value: {
percentage: {
value: "100.0",
},
},
};
return {
discountApplicationStrategy: DiscountApplicationStrategy.First,
discounts: [discount],
};
}
console.error("Cart does not meet the threshold for a discount or no gift product found.");
return EMPTY_DISCOUNT;
}