curl --request POST \
  --url https://api.voucherify.io/v2/loyalties/programs/{id}/card-definitions/batch \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --header 'X-App-Id: <api-key>' \
  --header 'X-App-Token: <api-key>' \
  --data '
{
  "assign": [
    {
      "id": "<string>"
    }
  ],
  "unassign": [
    {
      "id": "<string>"
    }
  ]
}
'

{
  "assigned": [
    {
      "card_type": "<string>",
      "card_definition_id": "<string>",
      "created_at": "2023-11-07T05:31:56Z",
      "object": "<string>"
    }
  ],
  "unassigned": [
    {
      "card_type": "<string>",
      "card_definition_id": "<string>",
      "created_at": "2023-11-07T05:31:56Z",
      "object": "<string>"
    }
  ]
}