fix(utils): add static identifier to AbstractNotificationProviderService (#11344)

.changeset/good-hornets-protect.md

@@ -0,0 +1,5 @@
+---
+"@medusajs/utils": patch
+---
+
+fix(utils): add static identifier to AbstractNotificationProviderService

packages/core/utils/src/notification/abstract-notification-provider.ts

@@ -48,6 +48,16 @@ import { INotificationProvider, NotificationTypes } from "@medusajs/types"
 export class AbstractNotificationProviderService
   implements INotificationProvider
 {
+  /**
+   * Each notification provider has a unique ID used to identify it.
+   * 
+   * @example
+   * class MyNotificationProviderService extends AbstractNotificationProviderService {
+   *   static identifier = "my-notification"
+   *   // ...
+   * }
+   */
+  static identifier: string
   /**
    * This method validates the options of the provider set in `medusa-config.ts`.
    * Implementing this method is optional. It's useful if your provider requires custom validation.