For the purpose of using the Bosch IoT Manager REST API, you need to authorize yourself as described below:
Click Tokens on the upper right corner of the Bosch IoT Manager user interface
Copy the Access Token value
Navigate to the Bosch IoT Manager REST API https://apidocs.bosch-iot-suite.com
Place the token value in the bearerAuth (http, Bearer) field
Confirm with Authorize to close the pop-up.
In the same manner, the Refresh Token value should be placed in the refreshToken (apiKey) field.