Etiketli müşterilere indirim

api_version = "2026-10"

[[extensions]]
name = "Discount by customer tag"
handle = "discount-by-customer-tag"
type = "function"

  [[extensions.targeting]]
  target = "cart.lines.discounts.generate.run"
  input_query = "src/cart_lines_discounts_generate_run.graphql"
  input_variables = { namespace = "$app", key = "function-configuration" }
  export = "cart-lines-discounts-generate-run"

  [extensions.build]
  command = ""
  path = "dist/function.wasm"

query CartLinesDiscountsGenerateRunInput($customerTags: [String!]) {
  cart {
    buyerIdentity {
      customer {
        hasAnyTag(tags: $customerTags)
      }
    }
  }
  discount {
    discountClasses
    metafield(namespace: "$app", key: "function-configuration") {
      jsonValue
    }
  }
}

// @ts-check

/**
 * @typedef {import("../generated/api").CartLinesDiscountsGenerateRunInput} CartLinesDiscountsGenerateRunInput
 * @typedef {import("../generated/api").CartLinesDiscountsGenerateRunResult} CartLinesDiscountsGenerateRunResult
 */

/**
 * Settings stored as JSON in the discount's metafield. The same metafield
 * feeds the query's $customerTags variable (see input_variables in
 * shopify.extension.toml), so Shopify checks the tags.
 */
const DEFAULT_CONFIG = {
  percentage: 10,
  message: "Member discount",
};

/** @type {CartLinesDiscountsGenerateRunResult} */
const NO_DISCOUNT = { operations: [] };

/**
 * @param {CartLinesDiscountsGenerateRunInput} input
 * @returns {CartLinesDiscountsGenerateRunResult}
 */
export function cartLinesDiscountsGenerateRun(input) {
  // A Function may only return operations for the classes the discount was created with.
  if (!input.discount.discountClasses.includes("ORDER")) return NO_DISCOUNT;
  // Guests have no customer record; tags only apply after the customer signs in.
  if (!input.cart.buyerIdentity?.customer?.hasAnyTag) return NO_DISCOUNT;

  const config = { ...DEFAULT_CONFIG, ...input.discount.metafield?.jsonValue };
  return {
    operations: [
      {
        orderDiscountsAdd: {
          candidates: [
            {
              message: config.message,
              targets: [{ orderSubtotal: { excludedCartLineIds: [] } }],
              value: { percentage: { value: String(config.percentage) } },
            },
          ],
          selectionStrategy: "FIRST",
        },
      },
    ],
  };
}