Log in to your Combidesk dashboard. You will find all your integration under 'My Apps'. When you activate an integration for the first time, you can click on the 'History' button on the integration. By clicking on it, a line will appear that can be clicked again. By doing this, a popup will appear with the history of the integration. Here you can see what the integration has processed and find error messages.

You can also see a column 'History' on the right side of your Combidesk dashboard. This is an overview of all integrations and synchronized data. This column will only appear once data has been synchronized.