medusa-store/www/apps/docs/content/references/notification/interfaces/notification.INotificationService.mdx

---
displayed_sidebar: core
---

import ParameterTypes from "@site/src/components/ParameterTypes"

# INotificationService

## Overview

:::note[Prerequisites]

Before creating a Notification Provider, [install an event bus module](https://docs.medusajs.com/development/events/modules/redis).

:::

A Notification Provider is a provider that handles sending and resending of notifications.

To create a Notification Provider, create a TypeScript or JavaScript file in `src/services`. The name of the file is the name of the provider
(for example, `sendgrid.ts`). The file must export a class that extends the `AbstractNotificationService` class imported from `@medusajs/medusa`.

For example, create the file `src/services/email-sender.ts` with the following content:

```ts title="src/services/email-sender.ts"
import { AbstractNotificationService } from "@medusajs/medusa"
import { EntityManager } from "typeorm"

class EmailSenderService extends AbstractNotificationService {
  protected manager_: EntityManager
  protected transactionManager_: EntityManager

  sendNotification(
    event: string,
    data: unknown,
    attachmentGenerator: unknown
  ): Promise<{
      to: string;
      status: string;
      data: Record<string, unknown>;
    }> {
    throw new Error("Method not implemented.")
  }
  resendNotification(
    notification: unknown,
    config: unknown,
    attachmentGenerator: unknown
  ): Promise<{
      to: string;
      status: string;
      data: Record<string, unknown>;
    }> {
    throw new Error("Method not implemented.")
  }

}

export default EmailSenderService
```

---

## Identifier Property

The `NotificationProvider` entity has 2 properties: `identifier` and `is_installed`. The value of the `identifier` property in the notification provider
class is used when the Notification Provider is created in the database.

The value of this property is also used later when you want to subscribe the Notification Provider to events in a [Loader](https://docs.medusajs.com/development/loaders/overview).

For example:

```ts
class EmailSenderService extends AbstractNotificationService {
  static identifier = "email-sender"
  // ...
}
```

---

## Properties

<ParameterTypes parameters={[{"name":"manager_","type":"`EntityManager`","description":"","optional":false,"defaultValue":"","expandable":false,"children":[]},{"name":"transactionManager_","type":"`undefined` \\| `EntityManager`","description":"","optional":false,"defaultValue":"","expandable":false,"children":[]},{"name":"__container__","type":"`any`","description":"","optional":false,"defaultValue":"","expandable":false,"children":[]},{"name":"__configModule__","type":"`Record<string, unknown>`","description":"","optional":true,"defaultValue":"","expandable":false,"children":[]},{"name":"__moduleDeclaration__","type":"`Record<string, unknown>`","description":"","optional":true,"defaultValue":"","expandable":false,"children":[]}]}  sectionTitle="INotificationService"/>

___

## Accessors

### activeManager\_

#### Returns

<ParameterTypes parameters={[{"name":"EntityManager","type":"`EntityManager`","optional":false,"defaultValue":"","description":"","expandable":false,"children":[]}]}  sectionTitle="activeManager_"/>

___

## Methods

### sendNotification

When an event is triggered that your Notification Provider is registered as a handler for, the [`NotificationService`](https://docs.medusajs.com/references/services/classes/services.NotificationService)
in the Medusa backend executes this method of your Notification Provider.

In this method, you can perform the necessary operation to send the Notification. For example, you can send an email to the customer when they place an order.

#### Example

```ts
class EmailSenderService extends AbstractNotificationService {
  // ...
  async sendNotification(
    event: string,
    data: any,
    attachmentGenerator: unknown
  ): Promise<{
      to: string;
      status: string;
      data: Record<string, unknown>;
    }> {
    if (event === "order.placed") {
      // retrieve order
      const order = await this.orderService.retrieve(data.id)
      // TODO send email

      console.log("Notification sent")
      return {
        to: order.email,
        status: "done",
        data: {
          // any data necessary to send the email
          // for example:
          subject: "You placed a new order!",
          items: order.items,
        },
      }
    }
  }
  // ...
}
```

#### Parameters

<ParameterTypes parameters={[{"name":"event","type":"`string`","description":"The name of the event that was triggered. For example, `order.placed`.","optional":false,"defaultValue":"","expandable":false,"children":[]},{"name":"data","type":"`unknown`","description":"The data payload of the event that was triggered. For example, if the `order.placed` event is triggered,\nthe `eventData` object contains the property `id` which is the ID of the order that was placed. You can refer to the\n[Events reference](https://docs.medusajs.com/development/events/events-list) for information on all events and their payloads.","optional":false,"defaultValue":"","expandable":false,"children":[]},{"name":"attachmentGenerator","type":"`unknown`","description":"If you’ve previously register an attachment generator to the `NotificationService` using the\n[`registerAttachmentGenerator`](https://docs.medusajs.com/references/services/classes/services.NotificationService#registerattachmentgenerator) method,\nyou have access to it here. You can use the `attachmentGenerator` to generate on-demand invoices or other documents. The default value of this parameter is `null`.","optional":false,"defaultValue":"","expandable":false,"children":[]}]}  sectionTitle="sendNotification"/>

#### Returns

<ParameterTypes parameters={[{"name":"Promise","type":"Promise&#60;[ReturnedData](notification.ReturnedData.mdx)&#62;","optional":false,"defaultValue":"","description":"The sending details.","expandable":false,"children":[{"name":"ReturnedData","type":"[ReturnedData](notification.ReturnedData.mdx)","optional":false,"defaultValue":"","description":"The details of a sent or resent notification.","expandable":false,"children":[{"name":"to","type":"`string`","description":"The receiver of the Notification. For example, if you sent an email to the customer then `to` is the email address of the customer.\nIn other cases, it might be a phone number or a username.","optional":false,"defaultValue":"","expandable":false,"children":[]},{"name":"status","type":"`string`","description":"The status of the sent notification. There are no restriction on the returned status.","optional":false,"defaultValue":"","expandable":false,"children":[]},{"name":"data","type":"`Record<string, unknown>`","description":"The data used to send the Notification. For example, if you sent an order confirmation email to the customer, then the `data` object\nmight include the order items or the subject of the email. This `data` is necessary if the notification is resent later as you can use the same data.","optional":false,"defaultValue":"","expandable":false,"children":[]}]}]}]}  sectionTitle="sendNotification"/>

### resendNotification

This method is used to resend notifications, which is typically triggered by the
[Resend Notification API Route](https://docs.medusajs.com/api/admin#notifications\_postnotificationsnotificationresend).

#### Example

```ts
class EmailSenderService extends AbstractNotificationService {
  // ...
  async resendNotification(
    notification: any,
    config: any,
    attachmentGenerator: unknown
  ): Promise<{
      to: string;
      status: string;
      data: Record<string, unknown>;
    }> {
    // check if the receiver should be changed
    const to: string = config.to || notification.to

    // TODO resend the notification using the same data
    // that is saved under notification.data

    console.log("Notification resent")
    return {
      to,
      status: "done",
      data: notification.data, // make changes to the data
    }
  }
}
```

#### Parameters

<ParameterTypes parameters={[{"name":"notification","type":"`unknown`","description":"The original [Notification record](https://docs.medusajs.com/references/entities/classes/Notification) that was created after you sent the\nnotification with `sendNotification`. It includes the `to` and `data` attributes which are populated originally using the `to` and `data` properties of\nthe object you return in [sendNotification](notification.INotificationService.mdx#sendnotification).","optional":false,"defaultValue":"","expandable":false,"children":[]},{"name":"config","type":"`unknown`","description":"The new configuration used to resend the notification. The [Resend Notification API Route](https://docs.medusajs.com/api/admin#notifications\\_postnotificationsnotificationresend),\nallows you to pass a new `to` field. If specified, it will be available in this config object.","optional":false,"defaultValue":"","expandable":false,"children":[]},{"name":"attachmentGenerator","type":"`unknown`","description":"f you’ve previously register an attachment generator to the `NotificationService` using the\n[`registerAttachmentGenerator`](https://docs.medusajs.com/references/services/classes/services.NotificationService#registerattachmentgenerator) method,\nyou have access to it here. You can use the `attachmentGenerator` to generate on-demand invoices or other documents. The default value of this parameter is `null`.","optional":false,"defaultValue":"","expandable":false,"children":[]}]}  sectionTitle="resendNotification"/>

#### Returns

<ParameterTypes parameters={[{"name":"Promise","type":"Promise&#60;[ReturnedData](notification.ReturnedData.mdx)&#62;","optional":false,"defaultValue":"","description":"The resend details.","expandable":false,"children":[{"name":"ReturnedData","type":"[ReturnedData](notification.ReturnedData.mdx)","optional":false,"defaultValue":"","description":"The details of a sent or resent notification.","expandable":false,"children":[{"name":"to","type":"`string`","description":"The receiver of the Notification. For example, if you sent an email to the customer then `to` is the email address of the customer.\nIn other cases, it might be a phone number or a username.","optional":false,"defaultValue":"","expandable":false,"children":[]},{"name":"status","type":"`string`","description":"The status of the sent notification. There are no restriction on the returned status.","optional":false,"defaultValue":"","expandable":false,"children":[]},{"name":"data","type":"`Record<string, unknown>`","description":"The data used to send the Notification. For example, if you sent an order confirmation email to the customer, then the `data` object\nmight include the order items or the subject of the email. This `data` is necessary if the notification is resent later as you can use the same data.","optional":false,"defaultValue":"","expandable":false,"children":[]}]}]}]}  sectionTitle="resendNotification"/>

### withTransaction

#### Parameters

<ParameterTypes parameters={[{"name":"transactionManager","type":"`EntityManager`","description":"","optional":true,"defaultValue":"","expandable":false,"children":[]}]}  sectionTitle="withTransaction"/>

#### Returns

<ParameterTypes parameters={[{"name":"this","type":"`this`","optional":false,"defaultValue":"","description":"","expandable":false,"children":[]}]}  sectionTitle="withTransaction"/>

### shouldRetryTransaction\_

#### Parameters

<ParameterTypes parameters={[{"name":"err","type":"`Record<string, unknown>` \\| `object`","description":"","optional":false,"defaultValue":"","expandable":false,"children":[]}]}  sectionTitle="shouldRetryTransaction_"/>

#### Returns

<ParameterTypes parameters={[{"name":"boolean","type":"`boolean`","optional":false,"defaultValue":"","description":"","expandable":false,"children":[]}]}  sectionTitle="shouldRetryTransaction_"/>

### atomicPhase\_

Wraps some work within a transactional block. If the service already has
a transaction manager attached this will be reused, otherwise a new
transaction manager is created.

#### Type Parameters

<ParameterTypes parameters={[{"name":"TResult","type":"`object`","description":"","optional":false,"defaultValue":"","expandable":false,"children":[]},{"name":"TError","type":"`object`","description":"","optional":false,"defaultValue":"","expandable":false,"children":[]}]}  sectionTitle="atomicPhase_"/>

#### Parameters

<ParameterTypes parameters={[{"name":"work","type":"(`transactionManager`: `EntityManager`) => Promise&#60;TResult&#62;","description":"the transactional work to be done","optional":false,"defaultValue":"","expandable":false,"children":[]},{"name":"isolationOrErrorHandler","type":"`IsolationLevel` \\| (`error`: TError) => Promise&#60;void \\| TResult&#62;","description":"the isolation level to be used for the work.","optional":true,"defaultValue":"","expandable":false,"children":[]},{"name":"maybeErrorHandlerOrDontFail","type":"(`error`: TError) => Promise&#60;void \\| TResult&#62;","description":"Potential error handler","optional":true,"defaultValue":"","expandable":false,"children":[]}]}  sectionTitle="atomicPhase_"/>

#### Returns

<ParameterTypes parameters={[{"name":"Promise","type":"Promise&#60;TResult&#62;","optional":false,"defaultValue":"","description":"the result of the transactional work","expandable":false,"children":[{"name":"TResult","type":"TResult","optional":false,"defaultValue":"","description":"","expandable":false,"children":[]}]}]}  sectionTitle="atomicPhase_"/>