curl --request GET \
  --url https://api.example.com/api/projects/{projectId}/branches/{branchId}/merge-preview \
  --header 'Authorization: Bearer <token>'

{
  "canMerge": true,
  "isUpToDate": true,
  "needsRebase": true,
  "changes": [
    {
      "file": "<unknown>",
      "from": "<unknown>",
      "to": "<unknown>"
    }
  ],
  "conflicts": [
    {
      "path": "<string>",
      "base": "<unknown>",
      "ours": "<unknown>",
      "theirs": "<unknown>",
      "modified": "<unknown>"
    }
  ],
  "stats": {
    "filesAdded": 123,
    "filesDeleted": 123,
    "filesModified": 123,
    "totalChanges": 123,
    "filesRenamed": 123
  },
  "message": "<string>"
}