Test ION API Call After completing the configuration in the connection point, you can run a test. Click TEST. A Test ION API Call dialog box is displayed. Specify, paste or upload an example input document. You cannot define message headers for testing of keywords. Keywords must be replaced with tested value directly in the ION API configuration. Optionally, click the Request tab to review Request before calling API. All path expressions are evaluated. If the option conversion in Request format was selected, the converted request is displayed. Click TEST. The request is send to API. If the conversion option was selected in output tab, the response is converted. The output document is displayed in the Output tab. Optionally, you can find the API response in the Response tab.