Laravel Wallet

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Payment ​

Payments as part of e-commerce are an important part. This section is about payment for goods.

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 interface to Item model.

Starting from version 9.x there are two product interfaces:

  • For an unlimited number of products (ProductInterface);
  • For a limited number of products (ProductLimitedInterface);

An example with an unlimited number of products:

php
use Bavix\Wallet\Traits\HasWallet;
use Bavix\Wallet\Interfaces\Customer;
use Bavix\Wallet\Interfaces\ProductInterface;

class Item extends Model implements ProductInterface
{
    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,
        ];
    }
}

Example with a limited number of products:

php
use Bavix\Wallet\Traits\HasWallet;
use Bavix\Wallet\Interfaces\Customer;
use Bavix\Wallet\Interfaces\ProductLimitedInterface;

class Item extends Model implements ProductLimitedInterface
{
    use HasWallet;

    public function canBuy(Customer $customer, int $quantity = 1, bool $force = false): bool
    {
        /**
         * This is where you implement the constraint logic. 
         * 
         * If the service can be purchased once, then
         *  return !$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,
        ];
    }
}

I do not recommend using the limited interface when working with a shopping cart. If you are working with a shopping cart, then you should override the PurchaseServiceInterface interface. With it, you can check the availability of all products with one request, there will be no N-queries in the database.

Proceed to purchase ​

Find the user and check the balance.

php
$user = User::first();
$user->balance; // 100

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);
$user->balance; // 0

What happens if the user does not have the funds? The same as with the withdrawal.

php
$user->balance; // 0
$user->pay($item);
// throw an exception

The question arises, how do you know that the product is purchased?

php
(bool)$user->paid($item); // bool(true)

Safe Pay ​

To not write try and catch use safePay method.

php
if ($user->safePay($item)) {
  // try to buy again )
}

It's simple!