diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3505409b..a788a512 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
 ## Unreleased
+- [#241](https://github.com/Shopify/shopify-api-php/pull/241) Add missing webhook topic constant definitions
 
 ## v4.2.0 - 2023-01-05
 
diff --git a/src/Webhooks/Topics.php b/src/Webhooks/Topics.php
index b05ba02b..46d4153b 100644
--- a/src/Webhooks/Topics.php
+++ b/src/Webhooks/Topics.php
@@ -13,11 +13,14 @@
 final class Topics
 {
     public const APP_PURCHASES_ONE_TIME_UPDATE = 'APP_PURCHASES_ONE_TIME_UPDATE';
+    public const APP_SUBSCRIPTIONS_APPROACHING_CAPPED_AMOUNT = 'APP_SUBSCRIPTIONS_APPROACHING_CAPPED_AMOUNT';
     public const APP_SUBSCRIPTIONS_UPDATE = 'APP_SUBSCRIPTIONS_UPDATE';
     public const APP_UNINSTALLED = 'APP_UNINSTALLED';
     public const ATTRIBUTED_SESSIONS_FIRST = 'ATTRIBUTED_SESSIONS_FIRST';
     public const ATTRIBUTED_SESSIONS_LAST = 'ATTRIBUTED_SESSIONS_LAST';
     public const ATTRIBUTION_RISK = 'ATTRIBUTION_RISK';
+    public const AUDIT_EVENTS_ADMIN_API_ACTIVITY = 'AUDIT_EVENTS_ADMIN_API_ACTIVITY';
+    public const BULK_OPERATIONS_FINISH = 'BULK_OPERATIONS_FINISH';
     public const CARTS_CREATE = 'CARTS_CREATE';
     public const CARTS_UPDATE = 'CARTS_UPDATE';
     public const CHANNELS_DELETE = 'CHANNELS_DELETE';
@@ -37,6 +40,7 @@ final class Topics
     public const CUSTOMERS_DELETE = 'CUSTOMERS_DELETE';
     public const CUSTOMERS_DISABLE = 'CUSTOMERS_DISABLE';
     public const CUSTOMERS_ENABLE = 'CUSTOMERS_ENABLE';
+    public const CUSTOMERS_MARKETING_CONSENT_UPDATE = 'CUSTOMERS_MARKETING_CONSENT_UPDATE';
     public const CUSTOMERS_UPDATE = 'CUSTOMERS_UPDATE';
     public const CUSTOMER_GROUPS_CREATE = 'CUSTOMER_GROUPS_CREATE';
     public const CUSTOMER_GROUPS_DELETE = 'CUSTOMER_GROUPS_DELETE';
@@ -56,6 +60,22 @@ final class Topics
     public const FULFILLMENTS_UPDATE = 'FULFILLMENTS_UPDATE';
     public const FULFILLMENT_EVENTS_CREATE = 'FULFILLMENT_EVENTS_CREATE';
     public const FULFILLMENT_EVENTS_DELETE = 'FULFILLMENT_EVENTS_DELETE';
+    public const FULFILLMENT_ORDERS_CANCELLATION_REQUEST_ACCEPTED = 'FULFILLMENT_ORDERS_CANCELLATION_REQUEST_ACCEPTED';
+    public const FULFILLMENT_ORDERS_CANCELLATION_REQUEST_REJECTED = 'FULFILLMENT_ORDERS_CANCELLATION_REQUEST_REJECTED';
+    public const FULFILLMENT_ORDERS_CANCELLATION_REQUEST_SUBMITTED = 'FULFILLMENT_ORDERS_CANCELLATION_REQUEST_SUBMITTED';
+    public const FULFILLMENT_ORDERS_CANCELLED = 'FULFILLMENT_ORDERS_CANCELLED';
+    public const FULFILLMENT_ORDERS_FULFILLMENT_REQUEST_ACCEPTED = 'FULFILLMENT_ORDERS_FULFILLMENT_REQUEST_ACCEPTED';
+    public const FULFILLMENT_ORDERS_FULFILLMENT_REQUEST_REJECTED = 'FULFILLMENT_ORDERS_FULFILLMENT_REQUEST_REJECTED';
+    public const FULFILLMENT_ORDERS_FULFILLMENT_REQUEST_SUBMITTED = 'FULFILLMENT_ORDERS_FULFILLMENT_REQUEST_SUBMITTED';
+    public const FULFILLMENT_ORDERS_FULFILLMENT_SERVICE_FAILED_TO_COMPLETE = 'FULFILLMENT_ORDERS_FULFILLMENT_SERVICE_FAILED_TO_COMPLETE';
+    public const FULFILLMENT_ORDERS_HOLD_RELEASED = 'FULFILLMENT_ORDERS_HOLD_RELEASED';
+    public const FULFILLMENT_ORDERS_LINE_ITEMS_PREPARED_FOR_LOCAL_DELIVERY = 'FULFILLMENT_ORDERS_LINE_ITEMS_PREPARED_FOR_LOCAL_DELIVERY';
+    public const FULFILLMENT_ORDERS_LINE_ITEMS_PREPARED_FOR_PICKUP = 'FULFILLMENT_ORDERS_LINE_ITEMS_PREPARED_FOR_PICKUP';
+    public const FULFILLMENT_ORDERS_MOVED = 'FULFILLMENT_ORDERS_MOVED';
+    public const FULFILLMENT_ORDERS_ORDER_ROUTING_COMPLETE = 'FULFILLMENT_ORDERS_ORDER_ROUTING_COMPLETE';
+    public const FULFILLMENT_ORDERS_PLACED_ON_HOLD = 'FULFILLMENT_ORDERS_PLACED_ON_HOLD';
+    public const FULFILLMENT_ORDERS_RESCHEDULED = 'FULFILLMENT_ORDERS_RESCHEDULED';
+    public const FULFILLMENT_ORDERS_SCHEDULED_FULFILLMENT_ORDER_READY = 'FULFILLMENT_ORDERS_SCHEDULED_FULFILLMENT_ORDER_READY';
     public const INVENTORY_ITEMS_CREATE = 'INVENTORY_ITEMS_CREATE';
     public const INVENTORY_ITEMS_DELETE = 'INVENTORY_ITEMS_DELETE';
     public const INVENTORY_ITEMS_UPDATE = 'INVENTORY_ITEMS_UPDATE';
@@ -65,8 +85,12 @@ final class Topics
     public const LOCALES_CREATE = 'LOCALES_CREATE';
     public const LOCALES_UPDATE = 'LOCALES_UPDATE';
     public const LOCATIONS_CREATE = 'LOCATIONS_CREATE';
+    public const LOCATIONS_DEACTIVATE = 'LOCATIONS_DEACTIVATE';
     public const LOCATIONS_DELETE = 'LOCATIONS_DELETE';
     public const LOCATIONS_UPDATE = 'LOCATIONS_UPDATE';
+    public const MARKETS_CREATE = 'MARKETS_CREATE';
+    public const MARKETS_DELETE = 'MARKETS_DELETE';
+    public const MARKETS_UPDATE = 'MARKETS_UPDATE';
     public const ORDERS_CANCELLED = 'ORDERS_CANCELLED';
     public const ORDERS_CREATE = 'ORDERS_CREATE';
     public const ORDERS_DELETE = 'ORDERS_DELETE';
@@ -76,6 +100,9 @@ final class Topics
     public const ORDERS_PARTIALLY_FULFILLED = 'ORDERS_PARTIALLY_FULFILLED';
     public const ORDERS_UPDATED = 'ORDERS_UPDATED';
     public const ORDER_TRANSACTIONS_CREATE = 'ORDER_TRANSACTIONS_CREATE';
+    public const PAYMENT_TERMS_CREATE = 'PAYMENT_TERMS_CREATE';
+    public const PAYMENT_TERMS_DELETE = 'PAYMENT_TERMS_DELETE';
+    public const PAYMENT_TERMS_UPDATE = 'PAYMENT_TERMS_UPDATE';
     public const PRODUCTS_CREATE = 'PRODUCTS_CREATE';
     public const PRODUCTS_DELETE = 'PRODUCTS_DELETE';
     public const PRODUCTS_UPDATE = 'PRODUCTS_UPDATE';
@@ -89,11 +116,32 @@ final class Topics
     public const PROFILES_DELETE = 'PROFILES_DELETE';
     public const PROFILES_UPDATE = 'PROFILES_UPDATE';
     public const REFUNDS_CREATE = 'REFUNDS_CREATE';
+    public const RETURNS_APPROVE = 'RETURNS_APPROVE';
+    public const RETURNS_CANCEL = 'RETURNS_CANCEL';
+    public const RETURNS_CLOSE = 'RETURNS_CLOSE';
+    public const RETURNS_DECLINE = 'RETURNS_DECLINE';
+    public const RETURNS_REOPEN = 'RETURNS_REOPEN';
+    public const RETURNS_REQUEST = 'RETURNS_REQUEST';
+    public const REVERSE_DELIVERIES_ATTACH_DELIVERABLE = 'REVERSE_DELIVERIES_ATTACH_DELIVERABLE';
+    public const REVERSE_FULFILLMENT_ORDERS_DISPOSE = 'REVERSE_FULFILLMENT_ORDERS_DISPOSE';
+    public const SCHEDULED_PRODUCT_LISTINGS_ADD = 'SCHEDULED_PRODUCT_LISTINGS_ADD';
+    public const SCHEDULED_PRODUCT_LISTINGS_REMOVE = 'SCHEDULED_PRODUCT_LISTINGS_REMOVE';
+    public const SCHEDULED_PRODUCT_LISTINGS_UPDATE = 'SCHEDULED_PRODUCT_LISTINGS_UPDATE';
+    public const SEGMENTS_CREATE = 'SEGMENTS_CREATE';
+    public const SEGMENTS_DELETE = 'SEGMENTS_DELETE';
+    public const SEGMENTS_UPDATE = 'SEGMENTS_UPDATE';
+    public const SELLING_PLAN_GROUPS_CREATE = 'SELLING_PLAN_GROUPS_CREATE';
+    public const SELLING_PLAN_GROUPS_DELETE = 'SELLING_PLAN_GROUPS_DELETE';
+    public const SELLING_PLAN_GROUPS_UPDATE = 'SELLING_PLAN_GROUPS_UPDATE';
     public const SHIPPING_ADDRESSES_CREATE = 'SHIPPING_ADDRESSES_CREATE';
     public const SHIPPING_ADDRESSES_UPDATE = 'SHIPPING_ADDRESSES_UPDATE';
     public const SHOP_UPDATE = 'SHOP_UPDATE';
+    public const SUBSCRIPTION_BILLING_ATTEMPTS_CHALLENGED = 'SUBSCRIPTION_BILLING_ATTEMPTS_CHALLENGED';
     public const SUBSCRIPTION_BILLING_ATTEMPTS_FAILURE = 'SUBSCRIPTION_BILLING_ATTEMPTS_FAILURE';
     public const SUBSCRIPTION_BILLING_ATTEMPTS_SUCCESS = 'SUBSCRIPTION_BILLING_ATTEMPTS_SUCCESS';
+    public const SUBSCRIPTION_BILLING_CYCLE_EDITS_CREATE = 'SUBSCRIPTION_BILLING_CYCLE_EDITS_CREATE';
+    public const SUBSCRIPTION_BILLING_CYCLE_EDITS_DELETE = 'SUBSCRIPTION_BILLING_CYCLE_EDITS_DELETE';
+    public const SUBSCRIPTION_BILLING_CYCLE_EDITS_UPDATE = 'SUBSCRIPTION_BILLING_CYCLE_EDITS_UPDATE';
     public const SUBSCRIPTION_CONTRACTS_CREATE = 'SUBSCRIPTION_CONTRACTS_CREATE';
     public const SUBSCRIPTION_CONTRACTS_UPDATE = 'SUBSCRIPTION_CONTRACTS_UPDATE';
     public const TAX_SERVICES_CREATE = 'TAX_SERVICES_CREATE';