Google Reviews can only be replied to once

The Synup API returns SY50121 in the errors array when this happens.

What the response looks like

{
  "data": null,
  "errors": [
    {
      "message": "Google Reviews can only be replied to once",
      "context": {},
      "code": "SY50121"
    }
  ]
}

Where it comes from

Documented under Interactions. The context field carries the offending value when one is relevant, and is empty otherwise.

See the full error code reference for every code the API can return.

Other Interactions errors