API Gateway supports core as well transaction-based licensing model. When API Gateway uses a transaction-based licensing model, then each service invocation is considered as a transaction and API Gateway keeps a track of these transactions. API Gateway transactions for the current month is compared with the maximum number of transactions allowed in a month. The maximum number of transactions that are allowed in a month is specified by the license agreement as represented in the licenseKey.xml file available in the <InstallDir>\IntegrationServer\instances\instance_name\config directory. Alternatively, you can also view the license file in Integration Server (in the Integration Server Administrator, go to Settings > Licensing link). For more information on licensing, see webMethods Integration Server Administrator’s Guide.

When the calculated transaction count is higher than the maximum transactions allowed per month, users are notified through an email or through a notification that appears in the API Gateway UI. You must have the manage user administration functional privilege assigned to view the usage details in the Analytics > API usage details page.