Does anyone have an example of how to formulate a request to update a pagelist inside a case using pega API JSON request , the below is given as example but is difficult to underatnd 

{
  "content": {},
  "pageInstructions": [
    {
      "instruction": "APPEND",
      "target": "myPageList",
      "listIndex": "3",
      "groupIndex": "Customer",
      "listMoveToIndex": "5",
      "content": {}
    }
  ]
}

***Edited by Moderator Marissa to update General to Product***