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Phase 2 Implementation Summary: Response DTOs

Overview

Successfully implemented Phase 2 of the type hinting improvements, adding strongly-typed Data Transfer Objects (DTOs) for API responses.

What Was Implemented

Core Response Infrastructure

  1. PaystackResponse - Generic wrapper for all API responses with type parameter support
  2. PaystackResponseException - Exception for failed API responses
  3. PaginationMeta - Structured pagination information with helper methods
  4. PaginatedResponse - Generic paginated collection response

Customer Response DTOs

  • CustomerData - Strongly-typed customer object with properties like:
    • id, customer_code, email, first_name, last_name
    • Helper methods: getFullName(), hasAuthorizations(), hasSubscriptions(), etc.
  • CustomerListResponse - Paginated customer list with typed CustomerData objects

Transaction Response DTOs

  • TransactionData - Complete transaction information with:
    • Status checking: isSuccessful(), isPending(), isFailed(), isAbandoned()
    • Amount helpers: getAmountInMajorUnit(), getFormattedAmount()
    • Customer info: getCustomerEmail(), getCustomerName()
  • TransactionInitializeResponse - Transaction initialization with:
    • authorization_url, access_code, reference
    • Helper: isInitialized()

PaymentRequest Response DTOs

  • PaymentRequestData - Payment request/invoice data with:
    • Status checking: isPending(), isPaid(), isPartiallyPaid(), isCancelled()
    • Calculations: getLineItemsTotal(), getTaxTotal(), getFormattedAmount()
    • Due date helpers: hasDueDate(), isOverdue(), getDueDateAsDateTime()

API Method Updates

Added typed response methods to:

  • Customer API: createTyped(), allTyped()
  • Transaction API: initializeTyped(), verifyTyped(), allTyped()
  • PaymentRequest API: createTyped(), allTyped()

Supporting Infrastructure

  • ResponseFactory - Factory methods for creating typed responses
  • ResponseMediator - Extended with typed response methods while maintaining backward compatibility

Files Created

Response DTOs

src/Response/
├── PaystackResponse.php
├── PaystackResponseException.php
├── PaginationMeta.php
├── PaginatedResponse.php
├── ResponseFactory.php
├── Customer/
│   ├── CustomerData.php
│   └── CustomerListResponse.php
├── Transaction/
│   ├── TransactionData.php
│   └── TransactionInitializeResponse.php
└── PaymentRequest/
    └── PaymentRequestData.php

Documentation & Examples

  • examples/typed_responses_demo.php - Comprehensive demonstration
  • Updated examples/README.md with Phase 2 information

Updated Files

  • src/HttpClient/Message/ResponseMediator.php - Added typed response methods
  • src/API/Customer.php - Added createTyped(), allTyped()
  • src/API/Transaction.php - Added initializeTyped(), verifyTyped(), allTyped()
  • src/API/PaymentRequest.php - Added createTyped(), allTyped()

Benefits

For Developers

  1. Type Safety - Catch errors at development time, not runtime
  2. IDE Support - Full autocomplete for all response properties
  3. Helper Methods - Convenient methods for common operations
  4. Structured Data - DateTimeImmutable for dates, proper types throughout
  5. Documentation - Inline PHPDoc visible in IDE tooltips

For Code Quality

  1. No Array Key Typos - Properties are strongly typed
  2. Refactoring Support - IDEs can track usage and rename safely
  3. Clear Contracts - Response structure is explicitly defined
  4. Future-Proof - Easy to extend with new methods and properties

Backward Compatibility

✅ 100% Backward Compatible

  • All existing array-based methods remain unchanged
  • Old code continues to work without modifications
  • New typed methods use *Typed() suffix pattern
  • Gradual migration path available

Testing

✅ All Tests Pass

  • 144 tests, 496 assertions
  • Zero regressions
  • Both old and new methods work correctly

Usage Examples

Before (v1.x - Array-based)

$response = $paystack->customers()->create([...]);
if ($response['status']) {
    $email = $response['data']['email']; // No autocomplete
}

After (v2.x - Typed DTOs)

$response = $paystack->customers()->createTyped([...]);
if ($response->isSuccessful()) {
    $customer = $response->getData(); // CustomerData object
    $email = $customer->email; // Full autocomplete!
    $name = $customer->getFullName(); // Helper method
}

Migration Strategy

  1. New Code: Use *Typed() methods immediately
  2. Existing Code: No changes required, works as-is
  3. Gradual Migration: Convert to typed methods during refactoring
  4. Both Supported: Use whichever approach fits your needs

Next Steps (Phase 3)

Phase 3 will introduce Request DTOs for type-safe API parameters:

  • Strongly-typed request objects instead of arrays
  • Validation at creation time
  • Builder patterns for complex requests
  • Full IDE support for required/optional parameters

Demo

Run the comprehensive demonstration:

php examples/typed_responses_demo.php

This shows:

  • Side-by-side comparison of old vs new approaches
  • All DTO features and helper methods
  • Pagination support
  • Backward compatibility
  • Real-world usage patterns

Conclusion

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.