Shopify Storefront API with Apollo Federation

Apollo Federation lets you define your Shopify Storefront API as one subgraph within a larger federated GraphQL graph, so that a gateway can resolve queries that also touch your custom services like reviews or inventory. The gateway stitches together responses from Shopify and your own resolvers into a single unified response for the storefront client.

Shopify's Storefront API is not natively built as an Apollo Federation subgraph, so you typically need to wrap it with a thin service that adds federation directives like @key and @extends. This wrapper service then participates in the gateway while delegating actual Shopify queries to the Storefront API.

Apollo Server v3 and v4 both support Federation through the @apollo/subgraph or @apollo/federation packages, which allow you to build subgraph schemas compatible with an Apollo Gateway. You should ensure your gateway and subgraph library versions are compatible when stitching Shopify data with custom services.

The Shopify Storefront API uses a token bucket rate limit system, so your federated resolvers should implement caching and request batching to avoid exhausting the allowance. Apollo Gateway's query planning can reduce redundant Shopify calls by consolidating field requests, but you still need to monitor throttle headers from Shopify responses.