List course assignments

curl --request POST \
  --url https://backend.codedamn.com/api/public/list-assignments \
  --header 'Content-Type: application/json' \
  --header 'FERMION-API-KEY: <api-key>' \
  --data '
{
  "data": [
    {
      "data": {
        "courseIdentifier": {
          "type": "product-id",
          "digitalProductId": "<string>"
        }
      }
    }
  ]
}
'

[
  {
    "output": {
      "status": "ok",
      "data": {
        "productId": "<string>",
        "productTitle": "<string>",
        "assignments": [
          {
            "assignmentId": "<string>",
            "assignmentTitle": "<string>"
          }
        ]
      }
    }
  }
]