shopify-functions

Shopify Functions run custom checkout logic on edge infrastructure by compiling deterministic WASM code, eliminating separate backend maintenance for discounts, shipping, and payment validation. They require a shopify.extension.toml, input.graphql, and a src/run file.

You can write Shopify Functions using either Rust with first-class support or JavaScript compiled via Javy. Both implementations require a standard structure including shopify.extension.toml, input.graphql, and a src/run file to process input data.

Implementing dynamic shipping rules without a backend is best achieved using Shopify Functions, which compile to WASM and execute on Shopify's edge infrastructure for deterministic, low-latency results directly at checkout.

To deploy a Shopify Function for product-specific discounts, create the extension using the CLI, implement the run function to process GraphQL input data, and follow the standard build and deployment workflow to your store.

Yes, Shopify Functions support payment validation logic at checkout. They execute deterministic, low-latency WASM code on Shopify's edge infrastructure, allowing you to tailor checkout experiences with custom payment rules.

Shopify Functions need deterministic logic to ensure predictable outcomes at checkout. Running WASM-based code on edge infrastructure requires deterministic execution to maintain fast, reliable performance for discounts, shipping, and payment operations.