> For the complete documentation index, see [llms.txt](https://martin-verbeek.gitbook.io/homey-google-nest-sdm/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://martin-verbeek.gitbook.io/homey-google-nest-sdm/english-guide/app-setup/google-cloud-project/enable-apis.md).

# Enable APIs

The Homey Nest SDM app needs some API´s enabled on the Google GCP Project, this allows the app to enable additional API´s and create subscriptions to the Google Event subsystem. This way the app is able to receive events from your Nest Devices. 

{% hint style="info" %}
You need to enable the Service Usage and the Resource Manager API services for your GCP project. Both links are below, just click and enable:
{% endhint %}

Make sure that the correct project is active. You will receive error code 403 Forbidden in the app when these API's are not enabled.

![](https://1513258806-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FznpQLgVaBkx36i2brOD4%2Fuploads%2F885jE2hZifpzEJmEgTPV%2Fimage.png?alt=media\&token=79162d89-b415-4a0c-bd9b-72f3a3b13a8e)

{% embed url="<https://console.cloud.google.com/apis/api/serviceusage.googleapis.com>" %}
Click to ENABLE or show status of the Service Usage API
{% endembed %}

{% embed url="<https://console.cloud.google.com/apis/api/cloudresourcemanager.googleapis.com>" %}
Click to ENABLE or show status of the Resource Manager API
{% endembed %}

{% hint style="info" %}
Below an example of the Service Usage API, the resource manager will look similar.
{% endhint %}

![](https://1513258806-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FznpQLgVaBkx36i2brOD4%2Fuploads%2FqU5k5Y3kkrJWZD4w0SMo%2Fimage.png?alt=media\&token=090d78bb-51c5-414e-870d-72609d6b7732)

{% hint style="danger" %}
Switch to the Homey Google Nest SDM App and select the Google Nest tab.
{% endhint %}