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Only the "id" portion of the query string. In your case that would be:
id=RgAAAAA0vdALrjlCRJYC%2BYbDc2QbBwCywlxEAOVUQKKi%2BMM/JAvVAAJLPcCrAACywlxEAOVUQKKi%2BMM/JAvVAAJLPccOAAAA
Actually, you would also get rid of the "id=" part of it too