# JPMC-PDP Documentation from https://developer.payments.jpmorgan.com

# Manage checkout notifications

Checkout notifications use a **polling and acknowledgement **model, where you poll for notification messages and acknowledge their receipt via API calls. In this guide, you will learn how to:

- Retrieve notifications for a given time period

- Acknowledge notifications

## Retrieve all notifications for a given time period

Retrieve all notifications for a given time period by performing the following steps:

1. Send a GET call on the /notifications endpoint.

2. Use the periodStart and periodEnd as query parameters.

> All notification messages for the past 30 days that have not been acknowledged will continue to be delivered with subsequent polling requests.
> 

The following is a sample request to retrieve all notifications from April 5 to April 6.

**Method: **`GET`
**Endpoint:** `/notifications?periodStart=2023-04-05T00:00:00.000000000Z&periodEnd=2023-04-06T00:00:00.000000000Z`

```json
{
    "messagesResponses": [
        {
            "createdAt": "2022-12-21T09:30:15.987Z",
            "orderNotification": {
                "transactionReferenceNumber": "Q12345-4447-228",
                "checkoutReference": "QSA2345"
            }
        }
    ]
}
```

## Acknowledge notifications

Acknowledge notifications you retrieved by performing a `POST` call to the `/notifications/ack` endpoint.

The following is a sample request to send an acknowledgement for a notification.

**Method: **`POST`
**Endpoint: **`/notifications/ack`

```json
{
    "messageInfos": [
        {
            "messageIdentifier": "d38e582e-27e1-4748-811b-79281f3bb714"
        }
    ]
}
```

**Response:**

```json
{
    "ackFailedMessages": [
        {
            "messageIdentifier": "d38e582e-27e1-4748-811b-79281f3bb714"
        }
    ]
}
```

## Related

[Notifications](/docs/commerce/online-payments/capabilities/checkout/notifications)