curl --request GET \
  --url https://api.firma.dev/functions/v1/signing-request-api/signing-requests/{id}/fields \
  --header 'Authorization: <api-key>'

{
  "results": [
    {
      "id": "field789-e89b-12d3-a456-426614174000",
      "companies_workspaces_signing_requests_id": "sr123-e89b-12d3-a456-426614174000",
      "companies_workspaces_signing_requests_users_id": "user456-e89b-12d3-a456-426614174000",
      "field_type": "signature",
      "required": 1,
      "x_postion": 100.5,
      "y_position": 200.75,
      "width": 200,
      "heigh": 50,
      "page_number": 1,
      "final_value": "data:image/png;base64,iVBOR...",
      "read_only": 0,
      "deleted": 0
    },
    {
      "id": "field012-e89b-12d3-a456-426614174000",
      "companies_workspaces_signing_requests_id": "sr123-e89b-12d3-a456-426614174000",
      "companies_workspaces_signing_requests_users_id": "user456-e89b-12d3-a456-426614174000",
      "field_type": "text",
      "required": 1,
      "x_postion": 150,
      "y_position": 300,
      "width": 250,
      "heigh": 30,
      "page_number": 1,
      "variable_name": "full_name",
      "final_value": "Alice Johnson",
      "read_only": 0,
      "deleted": 0
    }
  ]
}