Commerce administration dashboard

* Product catalogue
* Product categories
* Physical, digital, service, and bundle product types
* Product variants and option storage
* SKU management
* Product publishing states
* Pricing and comparison pricing
* Inventory quantities
* Low-stock thresholds
* Inventory movement history
* Customer records and addresses
* Orders and order items
* Payment and fulfilment statuses
* Payment transaction storage
* Promotions and coupon codes
* Shipping methods
* Tax rates
* Payment, shipping, tax, and inventory provider contracts
* Default manual payment provider
* Default flat-rate shipping provider
* Public product REST API
* Administration navigation
* Commerce permissions
* Module registration
* Module boot tests

Modules/Commerce/Contracts/InventoryProvider.php

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+<?php
+namespace Modules\Commerce\Contracts;
+use Modules\Commerce\Models\Product;
+interface InventoryProvider { public function adjust(Product $product, int $quantity, string $reason, ?int $userId = null): void; public function available(Product $product): int; }

Modules/Commerce/Contracts/PaymentProvider.php

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+<?php
+namespace Modules\Commerce\Contracts;
+use Modules\Commerce\Models\Order;
+interface PaymentProvider { public function charge(Order $order, array $data = []): array; public function refund(Order $order, float $amount): array; }

Modules/Commerce/Contracts/ShippingProvider.php

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+<?php
+namespace Modules\Commerce\Contracts;
+interface ShippingProvider { public function quote(array $address, float $subtotal): float; }

Modules/Commerce/Contracts/TaxProvider.php

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+<?php
+namespace Modules\Commerce\Contracts;
+interface TaxProvider { public function calculate(float $subtotal, array $address = []): float; }