Http access in order-discount extensions

Shopify Apps
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Topic summary

A developer wants to build an order-discount extension for Shopify that retrieves discount configurations from an external application via HTTP requests. They attempted to use fetch() within the run function but encountered issues.

Key limitation identified:

  • Shopify Functions cannot access the Internet or make external API calls during execution.

Recommended solution:

  • Store discount configurations as metafields on the discount node created in Shopify.
  • Query these metafields to pass configuration data as input variables to the function.

Use case context:

  • The developer is building a Shopify app to integrate their SaaS marketing platform with Shopify’s discount system.
Summarized with AI on November 15. AI used: claude-sonnet-4-5-20250929.
1

Hello everyone,

I want to build order-discount plugin for shopify. I need to get discount configuration from my application via http request. But i am unable to use fetch in run function.
Is there a possible way to handle it?

export function run(input: RunInput): FunctionRunResult {

  //get the configuration from the external api call

  const configuration: Configuration = JSON.parse(
    input?.discountNode?.metafield?.value ?? "{}"
  );

  

  fetch("https://api.github.com/users/hadley/orgs").then((res) => {
    //GET discount configuration from external api 
  });;

  return {
    discountApplicationStrategy: DiscountApplicationStrategy.Maximum,
    discounts: [
      {
        value: {
          percentage: {
            value: 5
          }
        },
        conditions: [
          {
            orderMinimumSubtotal: {
              minimumAmount: 1000,
              targetType: TargetType.OrderSubtotal,
              excludedVariantIds: []
            }
          }
        ],
        targets: [
          {
            orderSubtotal: {
              excludedVariantIds: []
            }
          }
        ],
        message: "5% off"
      },
      {
        value: {
          percentage: {
            value: 10
          }
        },
        targets: [
          {
            orderSubtotal: {
              excludedVariantIds: []
            }
          }
        ],
        message: "10% off"
      }
    ]
  };
};
2

Functions can’t access the Internet.

You need to store the discount configuration as a metafield on the discount node you create, and then query that configuration as part of the input variables to your function.

3

Thank Tobebuilds.

We have saas marketing suit, So we just need to build shopify app to integrate our marketing platform.

Thank you again your answer.