以下清單列出此方法的常見用途。將滑鼠遊標懸停在用途上，即可查看相關說明，或按一下用途，在 API Explorer 中載入範例參數值。您可以開啟全螢幕 API Explorer 查看程式碼範例，這些程式碼範例會動態更新以反映在 Explorer 中輸入的參數值。

下表列出此方法的常見用途。按一下用途名稱，即可在 APIs Explorer 中載入範例參數值。或者，您也可以按一下用途名稱下方的程式碼圖示，在全螢幕 API Explorer 中查看用途的程式碼範例。在全螢幕使用者介面中，您可以更新參數和屬性值，程式碼範例就會動態更新，反映輸入的值。

Use cases
list (by channel ID)	This example retrieves a list of channels that the specified channel subscribes to. In this example, the API response lists channels to which the GoogleDevelopers channel subscribes.
list (my subscriptions)	This example uses the mine parameter to retrieve a list of channels that subscribe to the authenticated user's channel.
check whether a subscription exists	This example determines whether the user authorizing the API request subscribes to the channel that the forChannelId parameter identifies. To check whether another channel (instead of the authorizing user's channel) subscribes to the specified channel, remove the mine parameter from this request and add the channelId parameter instead. In this example, the API response contains one item if you subscribe to the GoogleDevelopers channel. Otherwise, the request does not return any items.