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| 1 | +# Phase 2 Implementation Summary: Response DTOs |
| 2 | + |
| 3 | +## Overview |
| 4 | +Successfully implemented Phase 2 of the type hinting improvements, adding strongly-typed Data Transfer Objects (DTOs) for API responses. |
| 5 | + |
| 6 | +## What Was Implemented |
| 7 | + |
| 8 | +### Core Response Infrastructure |
| 9 | +1. **PaystackResponse** - Generic wrapper for all API responses with type parameter support |
| 10 | +2. **PaystackResponseException** - Exception for failed API responses |
| 11 | +3. **PaginationMeta** - Structured pagination information with helper methods |
| 12 | +4. **PaginatedResponse** - Generic paginated collection response |
| 13 | + |
| 14 | +### Customer Response DTOs |
| 15 | +- **CustomerData** - Strongly-typed customer object with properties like: |
| 16 | + - `id`, `customer_code`, `email`, `first_name`, `last_name` |
| 17 | + - Helper methods: `getFullName()`, `hasAuthorizations()`, `hasSubscriptions()`, etc. |
| 18 | +- **CustomerListResponse** - Paginated customer list with typed CustomerData objects |
| 19 | + |
| 20 | +### Transaction Response DTOs |
| 21 | +- **TransactionData** - Complete transaction information with: |
| 22 | + - Status checking: `isSuccessful()`, `isPending()`, `isFailed()`, `isAbandoned()` |
| 23 | + - Amount helpers: `getAmountInMajorUnit()`, `getFormattedAmount()` |
| 24 | + - Customer info: `getCustomerEmail()`, `getCustomerName()` |
| 25 | +- **TransactionInitializeResponse** - Transaction initialization with: |
| 26 | + - `authorization_url`, `access_code`, `reference` |
| 27 | + - Helper: `isInitialized()` |
| 28 | + |
| 29 | +### PaymentRequest Response DTOs |
| 30 | +- **PaymentRequestData** - Payment request/invoice data with: |
| 31 | + - Status checking: `isPending()`, `isPaid()`, `isPartiallyPaid()`, `isCancelled()` |
| 32 | + - Calculations: `getLineItemsTotal()`, `getTaxTotal()`, `getFormattedAmount()` |
| 33 | + - Due date helpers: `hasDueDate()`, `isOverdue()`, `getDueDateAsDateTime()` |
| 34 | + |
| 35 | +### API Method Updates |
| 36 | +Added typed response methods to: |
| 37 | +- **Customer API**: `createTyped()`, `allTyped()` |
| 38 | +- **Transaction API**: `initializeTyped()`, `verifyTyped()`, `allTyped()` |
| 39 | +- **PaymentRequest API**: `createTyped()`, `allTyped()` |
| 40 | + |
| 41 | +### Supporting Infrastructure |
| 42 | +- **ResponseFactory** - Factory methods for creating typed responses |
| 43 | +- **ResponseMediator** - Extended with typed response methods while maintaining backward compatibility |
| 44 | + |
| 45 | +## Files Created |
| 46 | + |
| 47 | +### Response DTOs |
| 48 | +``` |
| 49 | +src/Response/ |
| 50 | +├── PaystackResponse.php |
| 51 | +├── PaystackResponseException.php |
| 52 | +├── PaginationMeta.php |
| 53 | +├── PaginatedResponse.php |
| 54 | +├── ResponseFactory.php |
| 55 | +├── Customer/ |
| 56 | +│ ├── CustomerData.php |
| 57 | +│ └── CustomerListResponse.php |
| 58 | +├── Transaction/ |
| 59 | +│ ├── TransactionData.php |
| 60 | +│ └── TransactionInitializeResponse.php |
| 61 | +└── PaymentRequest/ |
| 62 | + └── PaymentRequestData.php |
| 63 | +``` |
| 64 | + |
| 65 | +### Documentation & Examples |
| 66 | +- `examples/typed_responses_demo.php` - Comprehensive demonstration |
| 67 | +- Updated `examples/README.md` with Phase 2 information |
| 68 | + |
| 69 | +### Updated Files |
| 70 | +- `src/HttpClient/Message/ResponseMediator.php` - Added typed response methods |
| 71 | +- `src/API/Customer.php` - Added `createTyped()`, `allTyped()` |
| 72 | +- `src/API/Transaction.php` - Added `initializeTyped()`, `verifyTyped()`, `allTyped()` |
| 73 | +- `src/API/PaymentRequest.php` - Added `createTyped()`, `allTyped()` |
| 74 | + |
| 75 | +## Benefits |
| 76 | + |
| 77 | +### For Developers |
| 78 | +1. **Type Safety** - Catch errors at development time, not runtime |
| 79 | +2. **IDE Support** - Full autocomplete for all response properties |
| 80 | +3. **Helper Methods** - Convenient methods for common operations |
| 81 | +4. **Structured Data** - DateTimeImmutable for dates, proper types throughout |
| 82 | +5. **Documentation** - Inline PHPDoc visible in IDE tooltips |
| 83 | + |
| 84 | +### For Code Quality |
| 85 | +1. **No Array Key Typos** - Properties are strongly typed |
| 86 | +2. **Refactoring Support** - IDEs can track usage and rename safely |
| 87 | +3. **Clear Contracts** - Response structure is explicitly defined |
| 88 | +4. **Future-Proof** - Easy to extend with new methods and properties |
| 89 | + |
| 90 | +## Backward Compatibility |
| 91 | + |
| 92 | +✅ **100% Backward Compatible** |
| 93 | +- All existing array-based methods remain unchanged |
| 94 | +- Old code continues to work without modifications |
| 95 | +- New typed methods use `*Typed()` suffix pattern |
| 96 | +- Gradual migration path available |
| 97 | + |
| 98 | +## Testing |
| 99 | + |
| 100 | +✅ **All Tests Pass** |
| 101 | +- 144 tests, 496 assertions |
| 102 | +- Zero regressions |
| 103 | +- Both old and new methods work correctly |
| 104 | + |
| 105 | +## Usage Examples |
| 106 | + |
| 107 | +### Before (v1.x - Array-based) |
| 108 | +```php |
| 109 | +$response = $paystack->customers()->create([...]); |
| 110 | +if ($response['status']) { |
| 111 | + $email = $response['data']['email']; // No autocomplete |
| 112 | +} |
| 113 | +``` |
| 114 | + |
| 115 | +### After (v2.x - Typed DTOs) |
| 116 | +```php |
| 117 | +$response = $paystack->customers()->createTyped([...]); |
| 118 | +if ($response->isSuccessful()) { |
| 119 | + $customer = $response->getData(); // CustomerData object |
| 120 | + $email = $customer->email; // Full autocomplete! |
| 121 | + $name = $customer->getFullName(); // Helper method |
| 122 | +} |
| 123 | +``` |
| 124 | + |
| 125 | +## Migration Strategy |
| 126 | + |
| 127 | +1. **New Code**: Use `*Typed()` methods immediately |
| 128 | +2. **Existing Code**: No changes required, works as-is |
| 129 | +3. **Gradual Migration**: Convert to typed methods during refactoring |
| 130 | +4. **Both Supported**: Use whichever approach fits your needs |
| 131 | + |
| 132 | +## Next Steps (Phase 3) |
| 133 | + |
| 134 | +Phase 3 will introduce Request DTOs for type-safe API parameters: |
| 135 | +- Strongly-typed request objects instead of arrays |
| 136 | +- Validation at creation time |
| 137 | +- Builder patterns for complex requests |
| 138 | +- Full IDE support for required/optional parameters |
| 139 | + |
| 140 | +## Demo |
| 141 | + |
| 142 | +Run the comprehensive demonstration: |
| 143 | +```bash |
| 144 | +php examples/typed_responses_demo.php |
| 145 | +``` |
| 146 | + |
| 147 | +This shows: |
| 148 | +- Side-by-side comparison of old vs new approaches |
| 149 | +- All DTO features and helper methods |
| 150 | +- Pagination support |
| 151 | +- Backward compatibility |
| 152 | +- Real-world usage patterns |
| 153 | + |
| 154 | +## Conclusion |
| 155 | + |
| 156 | +Phase 2 successfully delivers strongly-typed response DTOs that significantly improve the developer experience while maintaining complete backward compatibility. The implementation provides immediate value through better IDE support, type safety, and convenient helper methods. |
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