The Balance Control API lets you transfer funds between merchant accounts that belong to the same legal entity and are under the same company account. ## Authentication To connect to the Balance Control API, you must authenticate your requests with an [API key or basic auth username and password](https://docs.adyen.com/development-resources/api-authentication). To learn how you can generate these, see [API credentials](https://docs.adyen.com/development-resources/api-credentials).Here is an example of authenticating a request with an API key: ``` curl -H "X-API-Key: Your_API_key" \n-H "Content-Type: application/json" \n... ``` Note that when going live, you need to generate API credentials to access the [live endpoints](https://docs.adyen.com/development-resources/live-endpoints). ## Versioning The Balance Control API supports [versioning](https://docs.adyen.com/development-resources/versioning) using a version suffix in the endpoint URL. This suffix has the following format: "vXX", where XX is the version number. For example: ``` https://pal-test.adyen.com/pal/servlet/BalanceControl/v1/balanceTransfer ```

Versori has established itself as the third generation of Integration Platform as a Service (iPaaS). Versori builds custom integrations for its customers using an intuitive visual user interface.

Versori’s connector engine means there is no dependency on an existing library of apps, all you need to start is the documentation of the app or system you want to integrate to.