Get a collection

Gets a collection attached to an API. You can use the `versionId` query parameter to get a collection published in a version. **Note:** - You cannot use this endpoint to get a Git-linked API collection. Collections in a Git-linked API are stored in the linked Git repository, not in the Postman cloud. This endpoint only has access to Postman servers. - You can get a collection published in an API version with the `versionId` query parameter. - The `versionId` query parameter is a required pa...