[Video](https://www.youtube.com/watch?v=2gTCghy-dU4)

## Use a grouping ID


By default, adding multiple passes to a single
**Add to Google Wallet** link will not group those passes in the
user's Google Wallet app. However, passes can be grouped together by making
sure they all have the same grouping ID. Grouped passes will appear together
in the Google Wallet app. When a group of passes is selected, each pass will
be shown on a carousel.

Passes can be grouped together:

- During initial provisioning
- By using the [`update`](https://developers.google.com/wallet/retail/offers/rest/v1/offerobject/update) or [`patch`](https://developers.google.com/wallet/retail/offers/rest/v1/offerobject/patch) methods


To add a pass to a group, the `groupingInfo.groupingId` property of
the pass object must be set. All pass objects with the same
`groupingId` value will be automatically grouped together, even if
they were added separately.


The following example shows a loyalty card and offer being grouped together to
entice the user to make use of both in their next purchase.

```
loyaltyObject = {
  "classId": "ISSUER_ID.GIFT_CARD_CLASS_SUFFIX",
  "id": "ISSUER_ID.GIFT_CARD_OBJECT_SUFFIX",
  "state": "ACTIVE",
  "groupingInfo": {
    # Note the same groupingId value
    "groupingId": "combinedGiftCardAndOfferId",
    "sortIndex": 1
  },
  "barcode": {
    "type": "QR_CODE",
    "value": "QR code"
  },
  "accountId": "Account id",
  "accountName": "Account name",
  "loyaltyPoints": {
  "label": "Points",
    "balance": {
      "int": 800
    }
  }
}

offerObject = {
  "classId": "ISSUER_ID.OFFER_CLASS_SUFFIX",
  "id": "ISSUER_ID.OFFER_OBJECT_SUFFIX",
  "state": "ACTIVE",
  "groupingInfo": {
    # Note the same groupingId value
    "groupingId": "combinedGiftCardAndOfferId",
    "sortIndex": 2
  },
  "barcode": {
      "type": "QR_CODE",
      "value": "QR code",
  },
}
```