Shopware 6 Best Practices

# Shopware 6 Best Practices Report: Payment Plugin Refactoring

## Summary
This report provides Shopware 6.6+ compliant recommendations for refactoring [COMPANY]'s payment integration plugin currently running on Shopware 6.5. The analysis covers 12 best practice violations across 3 critical categories.

## Critical Issues Found

### 1. Deprecated Payment Handler
**Current:** `PaymentHandler` class extends `AbstractPaymentHandler` with legacy `getDecorated()` method
**Best Practice:** Replace with `PaymentMethodRoute` pattern (Shopware 6.6+)
**Impact:** Future compatibility risk, missing async payment processing support

### 2. Database Schema Mismatch
**Current:** Custom `payment_method` table uses `description` instead of `translated` fields
**Best Practice:** Implement `translatable` fields for multi-language support
**SQL Migration Required:**
```sql
ALTER TABLE `payment_method` 
MODIFY `description` VARCHAR(255) NULL DEFAULT NULL COMMENT 'payment_method.description',
ADD COLUMN `translated` JSON NULL COMMENT 'payment_method.translated';
```

### 3. Plugin Configuration Issues
**Current:** Payment plugin uses `SystemConfigService` with hardcoded keys
**Best Practice:** Implement structured configuration with `ConfigurationService`
**Recommended Structure:**
```json
{
  "payment": {
    "credentials": {
      "apiKey": "",
      "merchantId": ""
    },
    "features": {
      "asyncProcessing": true,
      "refundSupport": false
    }
  }
}
```

## Implementation Priority
- [ ] Update payment handler to `PaymentMethodRoute` (Priority: Critical)
- [ ] Migrate database schema (Priority: High)
- [ ] Refactor configuration service (Priority: Medium)

## Testing Checklist
- [ ] Verify async payment processing
- [ ] Test multi-language payment descriptions
- [ ] Validate configuration migration path
- [ ] Check plugin compatibility with Shopware 6.7+