Delete channel data
This API enables you to delete existing data for all channels. You can use either of the following approaches:<br/><br/>- **Option 1:** Use the `channel` key in the payload to delete all tokens in the specified channel.<br/>- **Option 2:** Use the `push` and `inapp` keys in the payload to delete specific tokens in these channels.<br/><br/>**Note:** You can use either option 1 or option 2. It is not allowed to use both approaches in one request.