# Overriding the FCM Sender ID

Sender ID overriding is not compatible with FCM tokens and forces a downgrade to Instance ID. As we move towards removing support for FCM Instance ID, support for this has been removed in Batch 1.21.

*Available in Batch 1.12.1 and higher*

When using FCM, Batch autodetects the Sender ID to use with the one set in your google-services.json.

If for any reason you want to specify another Sender ID, add the following line in your AndroidManifest.xml, under `<application>`:

```xml
<meta-data android:name="batch_push_fcm_sender_id_override" android:resource="@string/batch_fcm_sender_id" />
```

Then, add the matching String ressource with the Sender ID you want to use:

```xml
res/values/strings.xml

<string name="batch_fcm_sender_id">123456</string>
```

(You do not have to name your string ressource `batch_fcm_sender_id` , it can be anything as long as it is referenced in the manifest meta-data.)

You should also make sure that you migrate your legacy Google API Project to Firebase so that you do not accidentally delete it.


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