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{ "user": {
      "id": "SSP_UID",       // remains unchanged
      "buyeruid": "DSP_UID", // remains unchanged
      "ext": {
          "eids": [{
              "source": "id5-sync.com",
              "uids": [{
                  "id": "ID5-abc123" // the ID5 Universal ID
              }],
              "ext": {
                  "linkType": 2 // 0 = unlinked; 1 = probabilistic; 2 = deterministic
              }
          }]
      }
}}