How to use Azure DevOps REST API to Update File?

I'm trying to Update a test.json file hosted on a Azure DevOps Repo. I'm using a Logic App. Having trouble identifying the order of operations from the documentation.

I think I need to...

1. Issue a GET HTTP request to the Items endpoint:

   • https://dev.azure.com/myOrg/myProject/_apis/git/repositories/myRepoID/items?scopePath=/data/test.json&$format=json&api-version=6.0
   • Response:

   {
     "count": 1,
     "value": [
       {
         "objectId": "<longGUID>",
         "gitObjectType": "blob",
         "commitId": "<longGUID>",
         "path": "/data/test.json",
         "url": "https://dev.azure.com/myOrg/longGUID/_apis/git/repositories/myRepoID/items?path=%2Fdata%2Ftest.json&versionType=Branch&versionOptions=None"
       }
     ]
   }
   

2. Use the objectId in the response to issue a POST HTTP request to the Pushes endpoint

   • Body:

{
  "refUpdates": [
    {
      "name": "refs/heads/main",
      "oldObjectId": "<longGuid from previous response>"
    }
  ],
  "commits": [
    {
      "changes": [
        {
          "changeType": "edit",
          "item": {
            "path": "/data/test.json"
          },
          "newContent": {
            "content": "CHECK CHECK!",
            "contentType": "rawtext"
          }
        }
      ],
      "comment": "My commit message"
    }
  ]
}

Error:

• Status 409 Conflict

{
  "$id": "1",
  "innerException": null,
  "message": "TF401028: The reference 'refs/heads/main' has already been updated by another client, so you cannot update it. Please try again.",
  "typeName": "Microsoft.TeamFoundation.Git.Server.GitReferenceStaleException, Microsoft.TeamFoundation.Git.Server",
  "typeKey": "GitReferenceStaleException",
  "errorCode": 0,
  "eventId": 3000
}

Questions:

1. Am I correct on the order of operations?
2. How do I overcome this issue?

FIX: (Thank you @Leo_Liu-MSFT)

1. GET request to https://dev.azure.com/myOrg/myProject/_apis/git/repositories/repoID/commits?searchCriteria.$top=1&searchCriteria.itemVersion.version=main&api-version=6.0

2. POST request to https://dev.azure.com/myOrg/myProject/_apis/git/repositories/repoID/pushes

• Body:

{
  "commits": [
    {
      "changes": [
        {
          "changeType": "edit",
          "item": {
            "path": "<Your File To Update>"
          },
          "newContent": {
            "content": "CHECK CHECK!",
            "contentType": "rawtext"
          }
        }
      ],
      "comment": "<YOUR COMMIT MSG>"
    }
  ],
  "refUpdates": [
    {
      "name": "refs/heads/main",
      "oldObjectId": "<commitId from previous response>"
    }
  ]
}