# Interval and frequency required for trial period

Occurs when your request contains trial_period but interval and frequency are not present.

---

## Example

```json
{
  "error": {
    "type": "request_error",
    "code": "price_trial_period_missing_fields",
    "detail": "trial_period requires both interval and frequency to be set",
    "documentation_url": "https://developer.paddle.com/errors/prices/price_trial_period_missing_fields"
  },
  "meta": {
    "request_id": "00000000-0000-0000-0000-000000000000"
  }
}
```

## Details

| Attribute | Value |
| --- | --- |
| Status code | 400 |
| Error code | `price_trial_period_missing_fields` |
| Error message | trial_period requires both interval and frequency to be set |

## Common causes

- trial_period is included but both interval and frequency have not been set.

## Common solutions

- Add any missing properties to your request and try again.