How to get custom content from Confluence Cloud

How do you use this API?
https://developer.atlassian.com/cloud/confluence/rest/v2/api-group-custom-content/#api-custom-content-get

It requires the “type” parameter but it says nothing about what the possible values are. And I cannot find an API to return the list of possible types.

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If your custom content is from Connect the type will be of the format ac:my-addon-key:my-custom-content (doc).
If it is from Forge, it is forge:[APP_ID]:[ENVIRONMENT_ID]:[MODULE_KEY] (doc).