You can access the developer workbench by browsing to http://workbench.apstrata.com and logging in with your apstrata account's authentication key and secret.
You can download the developer workbench source code from hereYou also can read some tutorials on using the developer workbench in this wiki.
Configuring the Apstrata Service URL in the Developer Workbench
The apstrata service URL is simply the apstrata endpoint that you need to use when you login to the workbench. All other API requests made from within the developer workbench would use this endpoint.
In order to set the apstrata service URL, click on the "Preferences" link located at the bottom right corner of the login form. You need to do this configuration only once, since it will be saved for other times.
If you registered on Apstrata BAAS (back-end-as-a-service), then the apstrata service URL would be "https://varick.apstrata.com/apsdb/rest"
If you registered on Apstrata for IoT, then the apstrata service URL would be "https://wot.apstrata.com/apsdb/rest"