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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 $customer)
{
return round($this->price * 100);
}
public function getMetaProduct(): ?array
{
return [
'title' => $this->title,
'description' => 'Purchase of Product #' . $this->getUniqueId(),
];
}
public function getUniqueId(): string
{
return (string)$this->getKey();
}
}
```
## Fill the cart
Find the user and check the balance.
```php
$user = User::first();
$user->balance; // int(0)
```
Let's start shopping.
```php
use Bavix\Wallet\Objects\Cart;
$list = [
'potato' => 3,
'carrot' => 10,
];
$products = Item::query()
->whereIn('slug', ['potato', 'carrot'])
->get();
$cart = app(Cart::class);
foreach ($products as $product) {
// add product's
$cart->addItem($product, $list[$product->slug]);
}
$user->deposit($cart->getTotal());
$user->balanceFloat; // float(151.27)
(bool)$user->payCart($cart); // true
$user->balanceFloat; // float(0)
```
It worked!