Intregation Request Mapping Template of POST Method

post-integration-request.json

{
  "TableName": "URL-Shortener",
  "ConditionExpression": "attribute_not_exists(id)",
  "Key": {
    "shortId": {
      "S": $input.json('$.shortURL')
    }
  },
  "ExpressionAttributeNames": {
    "#u": "longURL",
    "#o": "owner"
  },
  "ExpressionAttributeValues": {
    ":u": {
      "S": $input.json('$.longURL')
    },
    ":o": {
      "S":  $input.json('$.owner')
    }
  },
  "UpdateExpression": "SET #u = :u, #o = :o",
  "ReturnValues": "ALL_NEW"
}