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## User Model
Add the `CanPay` trait and `Customer` interface to your User model.
> The trait `CanPay` already inherits `HasWallet`, reuse will cause an error.
```php
use Bavix\Wallet\Traits\CanPay;
use Bavix\Wallet\Interfaces\Customer;
class User extends Model implements Customer
{
use CanPay;
}
```
## Item Model
Add the `HasWallet` trait and `Product` interface to Item model.
```php
use Bavix\Wallet\Traits\HasWallet;
use Bavix\Wallet\Interfaces\Product;
use Bavix\Wallet\Interfaces\Customer;
class Item extends Model implements Product
{
use HasWallet;
public function canBuy(Customer $customer, int $quantity = 1, bool $force = null): bool
{
/**
* If the service can be purchased once, then
* return !$customer->paid($this);
*/
return true;
}
public function getAmountProduct(Customer $customer)
{
return 100;
}
public function getMetaProduct(): ?array
{
return [
'title' => $this->title,
'description' => 'Purchase of Product #' . $this->id,
];
}
public function getUniqueId(): string
{
return (string)$this->getKey();
}
}
```
## Santa Claus, give gifts
Find the user's and check the balance.
```php
$first = User::first();
$last = User::orderBy('id', 'desc')->first(); // last user
$first->getKey() !== $last->getKey(); // true
$first->balance; // int(115)
$last->balance; // int(0)
```
One user wants to give a gift to another.
Find the product.
```php
$item = Item::first();
$item->getAmountProduct($first); // int(100)
$item->balance; // int(0)
```
The first user buys the product and gives it.
> If the product uses the `Taxable` interface, then Santa will pay tax
```php
$first->gift($last, $item);
(bool)$last->paid($item, true); // bool(true)
$first->balance; // int(15)
$last->balance; // int(0)
$item->balance; // int(100)
```
It worked!