# Verify WordPress cPAddon availability This function verifies that the RPM-based WordPress® cPAddon exists on the system. You must install the WordPress Manager cPanel plugin to access this API function. Endpoint: GET /WordPressInstanceManager/is_installable_addon_available Version: 11.134.0.5 Security: BasicAuth ## Response 200 fields (application/json): - `apiversion` (integer) The version of the API. Example: 3 - `func` (string) The name of the method called. Example: "is_installable_addon_available" - `module` (string) The name of the module called. Example: "WordPressInstanceManager" - `result` (object) - `result.data` (integer) Whether the RPM-based WordPress cPAddon exists on the server. * - Exists. * - Does exist. Enum: 0, 1 - `result.errors` (array,null) List of errors if the API failed. - `result.messages` (array,null) List of messages generated by the API. - `result.metadata` (object) - `result.status` (integer) * - Success. * - Failed. Check the field for more details. Enum: 0, 1 - `result.warnings` (array,null) List of warnings generated by the API. Warnings describe non-critical failures or other problematic conditions noted while running a API.