# WHMCS\Billing\VAT\Verification\VerificationInterface

`Interface`

## Constants

| Name | Description |
|  --- | --- |
| `STATE_UNKNOWN` |  |
| `STATE_VERIFIED` |  |
| `STATE_UNVERIFIED` |  |


## Methods

### verify

```php
public function verify(VatNumber $vatNumber): Result
```

**Parameters**

| Type | Name | Description |
|  --- | --- | --- |
| `VatNumber` | `$vatNumber` |  |


**Returns** `Result`

### canVerify

```php
public function canVerify(VatNumber $vatNumber): bool
```