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Webhooks

The shopify_api gem provides webhook functionality to make it easy to both subscribe to and process webhooks. To implement in your app follow the steps outlined below.

Create a Webhook Handler

If you want to register for an http webhook you need to implement a webhook handler which the shopify_api gem can use to determine how to process your webhook. You can make multiple implementations (one per topic) or you can make one implementation capable of handling all the topics you want to subscribe to. To do this simply make a module or class that includes or extends ShopifyAPI::Webhooks::WebhookHandler and implement the handle method which accepts the following named parameters: topic: String, shop: String, and body: Hash[String, untyped]. An example implementation is shown below:

module WebhookHandler 
  include ShopifyAPI::Webhooks::Handler

  class << self
    def handle(topic:, shop:, body:)
      puts "Received webhook! topic: #{topic} shop: #{shop} body: #{body}"
    end
  end
end

Note: It is recommended that in order to respond quickly to the Shopify webhook request that the handler not do any heavy logic or network calls, rather it should simply enqueue the work in some job queue in order to be executed later.

Add to Webhook Registry

The next step is to add all the webhooks you would like to subscribe to for any shop to the webhook registry. To do this you can call ShopifyAPI::Webhooks::Registry.add_registration for each webhook you would like to handle. add_registration accepts a topic string, a delivery_method symbol (currently supporting :http, :event_bridge, and :pub_sub), a webhook path (the relative path for an http webhook) and a handler. This only needs to be done once when the app is started and we recommend doing this at the same time that you setup ShopifyAPI::Context. An example is shown below to register an http webhook:

registration = ShopifyAPI::Webhooks::Registry.add_registration(topic: "orders/create", delivery_method: :http, handler: WebhookHandler)

If you are only interested in particular fields, you can optionally filter the data sent by Shopify by specifying the fields parameter. Note that you will still receive a webhook request from Shopify every time the resource is updated, but only the specified fields will be sent:

registration = ShopifyAPI::Webhooks::Registry.add_registration(
  topic: "orders/create", 
  delivery_method: :http, 
  handler: WebhookHandler, 
  fields: ["number","note"] # this can also be a single comma separated string
)

Note: The webhooks you register with Shopify are saved in the Shopify platform, but the local ShopifyAPI::Webhooks::Registry needs to be reloaded whenever your server restarts.

EventBridge and PubSub Webhooks

You can also register webhooks for delivery to Amazon EventBridge or Google Cloud Pub/Sub. In this case the path argument to Shopify.Webhooks.Registry.register needs to be of a specific form.

For EventBridge, the path must be the ARN of the partner event source.

For Pub/Sub, the path must be of the form pubsub://[PROJECT-ID]:[PUB-SUB-TOPIC-ID]. For example, if you created a topic with id red in the project blue, then the value of path would be pubsub://blue:red.

When registering for an EventBridge or PubSub Webhook you do not need to specify a handler as this is only used for handling Http webhooks.

Register a Webhook for a Shop

At any point that you have a session for a shop you can register to receive webhooks for that shop. We recommend registering for webhooks immediately after OAuth.

This can be done in one of two ways:

If you would like to register to receive webhooks for all topics you have added to the registry for a specific shop you can simply call:

ShopifyAPI::Webhooks::Registry.register_all(session: shop_session)

This will return an Array of ShopifyAPI::Webhooks::RegisterResults that have fields topic, success, and body which can be used to see which webhooks were successfully registered.

Or if you would like to register to receive webhooks for specific topics that have been added to the registry for a specific shop you can simply call register for any needed topics:

ShopifyAPI::Webhooks::Registry.register(topic: "<specific-topic>", session: shop_session)

This will return a single ShopifyAPI::Webhooks::RegisterResult.

Unregister a Webhook

To unregister a topic from a shop you can simply call:

ShopifyAPI::Webhooks::Registry.unregister(topic: "orders/create", session: shop_session)

Process a Webhook

To process an http webhook, you need to listen on the route(s) you provided during the Webhook registration process, then when the route is hit construct a ShopifyAPI::Webhooks::Request and call ShopifyAPI::Webhooks::Registry.process. This will verify the request did indeed come from Shopify and then call the specified handler for that webhook. An example in Rails is shown below:

class WebhookController < ApplicationController
  def webhook
    ShopifyAPI::Webhooks::Registry.process(
      ShopifyAPI::Webhooks::WebhookRequest.new(raw_body: request.raw_post, headers: request.headers.to_h)
    )
    render json: {success: true}.to_json
  end
end