> ## Documentation Index
> Fetch the complete documentation index at: https://developers.referralful.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Errors

> Standard HTTP status codes with a JSON error message.

The API uses conventional HTTP status codes. Errors return a JSON body with an `error`
string.

```json theme={null}
{ "error": "email is required." }
```

| Status | Meaning                                              |
| ------ | ---------------------------------------------------- |
| `200`  | Success                                              |
| `201`  | Resource created                                     |
| `401`  | Missing or invalid API key                           |
| `404`  | Resource not found                                   |
| `422`  | Validation failed (e.g. a required field is missing) |
| `500`  | Something went wrong on our end                      |