Click Add integration in Settings | Integrations and Keys, and search for Thumbnail.ws. Click Continue, specify a key name, and click Save.
In the Integrations list, where your key is now included, click Authenticate..
Once you have signed up to Thumbnail.ws, you will receive an API key in your e-mail. Enter the key and click Save.
To verify that the connector is set up correctly, do the following.
Add a new action in a script.
Search for screenshot to find the Thumbnail.ws action.
Fill out the inputs.
Assign the key that you created earlier.
Run the script and take note of the output in Transposit, showing a screenshot of the specified webpage.