API call to make to include 3 series accounts as well in this account string `!(uniqueName.startsWith("2"))`)

Hi @ArjunYV,

For any partial update on source you can use : update-source | SailPoint Developer Community

If you your source details via api you must identify which attribute contain this filter and use the patch source endpoint to update this attribute :
For example here the body of update source description attribute :

[
  {
    "op": "replace",
    "path": "/description",
    "value": "New description"
  }
]

Or another pretty simple way is to use SailPoint IdentityNow VS Code Extension Now Available - Announcements - SailPoint Developer Community with that plugin, you can update all your source information by editing a json file.