Your IP : 216.73.217.77
## 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 `ProductInterface` (or `ProductLimitedInterface`) interface to Item model.
```php
use Bavix\Wallet\Traits\HasWallet;
use Bavix\Wallet\Interfaces\Customer;
use Bavix\Wallet\Interfaces\Taxable;
use Bavix\Wallet\Interfaces\ProductLimitedInterface;
class Item extends Model implements ProductLimitedInterface, Taxable
{
use HasWallet;
public function canBuy(Customer $customer, int $quantity = 1, bool $force = false): bool
{
/**
* If the service can be purchased once, then
* return !$customer->paid($this);
*/
return true;
}
public function getAmountProduct(Customer $customer): int|string
{
return 100;
}
public function getMetaProduct(): ?array
{
return [
'title' => $this->title,
'description' => 'Purchase of Product #' . $this->id,
];
}
public function getFeePercent()
{
return 0.03; // 3%
}
}
```
## Tax process
Find the user and check the balance.
```php
$user = User::first();
$user->balance; // 103
```
Find the goods and check the cost.
```php
$item = Item::first();
$item->getAmountProduct($user); // 100
```
The user can buy a product, buy...
```php
$user->pay($item); // success, 100 (product) + 3 (fee) = 103
$user->balance; // 0
```
## Minimal Taxing
Add interface `MinimalTaxable` (or `MaximalTaxable`) in class `Item`.
```php
use Bavix\Wallet\Traits\HasWallet;
use Bavix\Wallet\Interfaces\Customer;
use Bavix\Wallet\Interfaces\MinimalTaxable;
use Bavix\Wallet\Interfaces\ProductInterface;
class Item extends Model implements ProductInterface, MinimalTaxable
{
use HasWallet;
public function getAmountProduct(Customer $customer): int|string
{
return 100;
}
public function getMetaProduct(): ?array
{
return [
'title' => $this->title,
'description' => 'Purchase of Product #' . $this->id,
];
}
public function getFeePercent()
{
return 0.03; // 3%
}
public function getMinimalFee()
{
return 5; // 3%, minimum 5
}
}
```
#### Successfully
Find the user and check the balance.
```php
$user = User::first();
$user->balance; // 105
```
Find the goods and check the cost.
```php
$item = Item::first();
$item->getAmountProduct($user); // 100
```
The user can buy a product, buy...
```php
$user->pay($item); // success, 100 (product) + 5 (minimal fee) = 105
$user->balance; // 0
```
#### Failed
Find the user and check the balance.
```php
$user = User::first();
$user->balance; // 103
```
Find the goods and check the cost.
```php
$item = Item::first();
$item->getAmountProduct($user); // 100
```
The user can buy a product, buy...
```php
$user->safePay($item); // failed, 100 (product) + 5 (minimal fee) = 105
$user->balance; // 103
```
It worked!