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 Dashboard
Copy the Access Token value
Once in the Bosch IoT Manager REST API, click Authorize
Place the token value in the bearerAuth (http, Bearer) field
In the same manner, the Refresh Token value should be placed in the refreshToken (apiKey) field.