[GraphQL] Can I filter cards by custom field values?

I’ve seen here (https://developers.pipefy.com/changelog/new-graphql-feature-query-cards-by-updated_at) that we can filter cards by using built-in field liks update_at.

How can I filter my cards by a custom field? Let’s say i have a field called “customer_id”. I tried this but didnt get it to work:

query allCardUpdatedYesterday { allCards(first: 20, pipeId: 123,filter: { field: "customer_id", operator: equal, value: "87y8-b7a6b-8a6c"}) { edges { node { id title } } } }

Do I have to prefix the field id with something?

The response I get does not add much:

{
  "data": {
    "allCards": null
  },
  "errors": [
    {
      "message": "Something went wrong",
      "locations": [
        {
          "line": 18,
          "column": 3
        }
      ],
      "path": [
        "allCards"
      ],
      "code": 30000,
      "type": "ExecutionError"
    }
  ]
}