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What are Functions?

Shopify Functions are serverless functions that customize discounts, payments, shipping, and validation logic.

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Function Types

Discounts

Volume discounts, BOGO, tiered pricing

Payment Customization

Hide/rename payment methods

Shipping Customization

Custom shipping rates and rules

Validation

Cart and checkout validation

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Example: Volume Discount

export function run(input) {
  const quantity = input.cart.lines.reduce((total, line) => total + line.quantity, 0);
  
  if (quantity >= 10) {
    return {
      discounts: [{
        value: { percentage: { value: 20 } },
        targets: [{ productVariant: { id: "gid://..." } }]
      }]
    };
  }
  
  return { discounts: [] };
}

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Key Features

  • JavaScript/Rust: Write in familiar languages
  • Fast Execution: Sub-100ms execution time
  • GraphQL Input: Query cart and customer data
  • Metafield Config: Configure via Shopify admin