# Connectors
Connectors link your flow to external services and APIs; like Slack, HubSpot, or Google Sheets, enabling seamless data exchange.
When you add a connector step, you’ll go through:
* **Select:** Choose the **group type** (Fastn Connector or Custom Connector) → then select the **app**.
* **Endpoint:** Pick the task you want to automate (e.g., `sendMessage`, `getContacts`).
* **Connect:** Authenticate by connecting your account.
For example, for the Google Cloud Storage Connector, a selected endpoint can be createBucket.
* **Configure:** Fill in the required fields or map from previous steps.
In this example,
### **Google Cloud Storage - Create Bucket**
This connector action lets you create a new storage bucket in your Google Cloud project. You can map variables or outputs from previous steps into its configuration.
#### **Params mapped in configuration**
```
param.project = {{var.googleProjectId}}
body.storageClass = STANDARD
body.name = {{var.bucketName}}
body.location = US
```
* `param.project` is mapped from a variable that holds your GCP project ID (`googleProjectId`).
* `body.name` is dynamically mapped from a variable `bucketName` ; allowing each flow run to create a bucket with a unique name.
* `body.storageClass` and `body.location` are fixed values here (`STANDARD`, `US`) but could also be mapped from variables or other steps.
{% hint style="info" %}
The configuration parameters can be static values or mapped from previous steps as shown in this example.
{% endhint %}
