<p>This article guides you through the process of calling the API services published by other providers. You must follow these steps:</p> <ol> <li>Create a group</li> <li>Create an API</li> <li>Create an app</li> <li>Obtain authorization</li> <li>Call an API</li> </ol> <p>Three elements of calling an API:</p> <ul> <li><strong>API: </strong>The API you are going to call, you must obtain detailed parameter definitions</li> <li><strong>App: </strong>The app is your identity when calling the API. AppId and AppSecret are used for authentication.</li> <li><strong>Permission between API and app: </strong>The app must be authorized to call the API. This permission can be set up through the authorization function.</li> </ul>