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

{
  "results": [
    {
      "id": "field123-e89b-12d3-a456-426614174000",
      "type": "signature",
      "required": true,
      "recipient_id": "user123-uuid",
      "variable_name": null,
      "position": {
        "x": 100,
        "y": 200,
        "width": 200,
        "height": 50
      },
      "page_number": 1,
      "dropdown_options": null,
      "multi_group_id": null,
      "date_signing_default": false,
      "format_rules": null,
      "validation_rules": null,
      "read_only": false,
      "read_only_value": null
    },
    {
      "id": "field456-e89b-12d3-a456-426614174000",
      "type": "date",
      "required": true,
      "recipient_id": "user123-uuid",
      "variable_name": null,
      "position": {
        "x": 100,
        "y": 250,
        "width": 150,
        "height": 30
      },
      "page_number": 1,
      "dropdown_options": null,
      "multi_group_id": null,
      "date_signing_default": true,
      "format_rules": {
        "date_format": "MM/DD/YYYY"
      },
      "validation_rules": null,
      "read_only": false,
      "read_only_value": null
    }
  ]
}