You can report any issues you encounter using Indigo APIs in the Issues tab of the developer portal. You can also read and comment on issues reported by other API developers in this tab. 

To report an issue in the API developer portal, click on Issues in the toolbar. Then, select the API with which you have an issue under the API row and add a title and description. You can attach files if necessary.

Click on Report issue when finished.

The reported issue will be listed in the Issues tab. 

You can open other issues and leave comments on them.