# Using the API

How to make basic calls to packaged APIs

## Making basic calls

In order to make actual POST / GET etc. calls to your published APIs, you will need to retrieve the base url from the operations section:

> **Warning:** It is not currently possible to whitelabel the base url for your API management projects

![app-base-url](https://tray.ai/documentation/images/platform/api-management/using-the-api/5qjtsq7qWDIbHtDVRv4Oio_app-base-url.png)

Then you can make any external calls by appending the endpoint path onto the base url:

![call-api](https://tray.ai/documentation/images/platform/api-management/using-the-api/58pcLBpd9MGfdzbEge30m_call-api.png)

## Authenticating calls

To authenticate your calls you will need a client-associated token.

this can then be passed as a bearer with any API calls, i.e.:

```json
{
"Authorization": "Bearer 39e8fh3rfxxxxxxxxxxd9df2e"
}
```