Original Task

Add Pagination Support for Transaction Listing

Implement both manual and automatic pagination handling:

Acceptance Criteria:

• Enhance list() method to handle single page results with pagination metadata
• Implement listAll() method that returns a PHP Generator for automatic pagination
• Add pagination metadata to response (currentPage, totalPages, totalRecords, hasNextPage)
• Handle API pagination parameters correctly (page, page_size)
• Implement memory-efficient streaming using Generators
• Add pagination unit tests covering edge cases (empty results, single page, multiple pages)
• Document pagination usage patterns

Technical Notes:

• Use PHP Generators to avoid loading all results into memory
• Follow the pattern: foreach ($resource->listAll($request) as $transaction)
• Handle API errors gracefully during pagination
• Set sensible default page_size (50-100 records)
• Include pagination state in exception messages for debugging

Additional Context

Relevant Context for Pagination Implementation

SDK Architecture Patterns (Critical for Implementation)

Resource Base Class Pattern (SipayResource):

• All resources extend SipayResource which provides request() method for HTTP calls
• Resources use mapper classes (extending SipayResourceMapper) for parsing responses
• Error handling via handleErrorResponse()
• Return self for method chaining

Response Structure Pattern:

// Expected API response format (from technical analysis):
{
  "status_code": 100,
  "status_description": "Successful",
  "data": [ /* array of transactions */ ],
  "pagination": {
    "current_page": 1,
    "total_pages": 10,
    "page_size": 100,
    "total_records": 950
  }
}

Mapper Pattern (for parsing pagination metadata):

class XxxMapper extends SipayResourceMapper implements JsonMapper
{
    public function mapJsonBody(): XxxResource {
        if (isset($this->jsonBody->data)) {
            $this->resource->setData($this->jsonBody->data);
        }
        return $this->resource;
    }
}

Key Technical Constraints

1. No Existing Pagination: The SDK currently has NO pagination support in any resource - this is a new capability
2. PHP Version: PHP 7.4+ with strict types (declare(strict_types=1);)
3. Memory Efficiency: Design doc emphasizes "handles large datasets gracefully without excessive memory use" - Generators are essential
4. Default Page Size: Design doc recommends "sensible defaults while allowing customization (e.g., default page size)" and ticket suggests 50-100 records

API Behavior (from Design Doc)

Critical Default Warning: "By default, the API only returns the last 3 days if no date is passed" - this affects how pagination interacts with date filtering

Pagination Parameters:

• page - page number
• page_size - records per page
• These are request parameters that need to be handled in TransactionListRequest

Testing Infrastructure

Test Pattern (from technical context):

• Extend Sipay\TestCase
• Mock HttpClient for unit tests
• Use createMockResponse() helper
• PHPUnit 9.6 is used

Required Test Coverage (from ticket):

• Empty results
• Single page
• Multiple pages
• Edge cases

Code Style Conventions

• Method naming: camelCase (so list() and listAll())
• Getters/setters pattern with fluent interface (return $this)
• Type hints required for all parameters and return types
• Strict types declaration at file top

Implementation Notes from Design Doc

Expected Usage Pattern:

// Manual pagination
$request->setPage(1)->setPageSize(100);
$transactions = $sipay->transactionListResource()->list($request);

// Auto-pagination (Generator-based)
foreach ($resource->listAll($request) as $transaction) {
    // Process each transaction without loading all into memory
}

Pagination Metadata Required (from ticket):

• currentPage
• totalPages
• totalRecords
• hasNextPage

Error Handling Requirement (from ticket): "Include pagination state in exception messages for debugging" - need to track current page/state when errors occur during auto-pagination

I'll help you implement pagination support for transaction listing in the Sipay SDK. Let me start by exploring the codebase structure to understand the current implementation.


Let me search for transaction list related files:


Good! I found the CardList resource which I can use as a reference. Let me examine it and also check if there's already any transaction list functionality:


Now let me check the TestCase and RequestPayload base classes:


Now let me check if there's already a main Sipay class to see how resources are accessed:


Perfect! Now I understand the structure. Let me create a todo list and start implementing the pagination support for transaction listing:


Let me start by examining what a Transaction might look like and then create the necessary files:


Now let me create the Transaction model class first:


Now let me create the TransactionMapper:


Now let me create the TransactionListRequest with pagination parameters:


Now let me create the TransactionListMapper that handles pagination metadata:


Now let me create the TransactionList resource with both list() and listAll() methods:


Now let me add the transactionListResource() method to the main Sipay class:


Now let me create comprehensive unit tests for pagination:


Now let me also create tests for the TransactionListRequest:


Now let me run the tests first to ensure everything works, then run PHP CS Fixer:


I need to fix the exception handling. Let me check the InvalidRequestException class to see the correct method names:


I see - the method is `getHttpStatus()` not `getHttpStatusCode()`, and `getSipayCode()` should be `getSipayStatusCode()`. Let me fix the TransactionList class:


Now let me run the tests again:


Great! Now let me run the TransactionListRequest tests:


I need to check what `getJsonObject()` returns. Let me look at the JsonBuilder:


I see - `getObject()` returns an array, not an object. The test expectations are wrong. Let me update the tests to check for array instead:


Excellent! Now let me run PHP CS Fixer to ensure code style compliance:


Perfect! PHP CS Fixer has fixed the code style. Now let me run all the tests to make sure everything still works:


Excellent! All tests pass. Now let me create a sample file to demonstrate the usage of pagination:


Now let me run the CS fixer on the sample file as well:


Perfect! Now let me verify all tests pass one final time:


Perfect! All tests pass. Let me create a quick summary document showing what files were created/modified:

Summary

Successfully implemented comprehensive pagination support for transaction listing in the Sipay PHP SDK. The implementation includes both manual pagination (via list() method) and automatic pagination (via listAll() method using PHP Generators) for memory-efficient processing of large datasets.

Files Modified:

• src/Sipay/Sipay.php - Added transactionListResource() method to access the new Transaction List resource

Files Created:

Core Implementation Files:

1. src/Sipay/Resources/Transaction.php - Model class representing individual transaction entities with properties like id, invoice_id, amount, currency, status, etc.

2. src/Sipay/Resources/TransactionList.php - Main resource class containing:

   • list() method for single-page retrieval with pagination metadata
   • listAll() Generator method for memory-efficient automatic pagination
   • Pagination metadata properties and accessors (currentPage, totalPages, pageSize, totalRecords)
   • Helper methods: hasNextPage(), hasPreviousPage()

3. src/Sipay/Resources/Mapper/TransactionMapper.php - Maps JSON response data to Transaction objects

4. src/Sipay/Resources/Mapper/TransactionListMapper.php - Maps JSON response including both transaction data array and pagination metadata

5. src/Sipay/Requests/TransactionListRequest.php - Request object with pagination parameters:

   • page - Page number
   • pageSize - Records per page (default: 100)
   • startDate / endDate - Date range filters
   • status - Transaction status filter
   • orderReference - Order reference filter

Test Files:

6. tests/Sipay/Resources/TransactionListTest.php - Comprehensive unit tests (11 tests, 371 assertions) covering:

   • Empty results
   • Single page results
   • Multiple pages (first, middle, last)
   • Default pagination parameters
   • Filters application
   • listAll() with empty, single, and multiple pages
   • Error handling with pagination state in exception messages

7. tests/Sipay/Requests/TransactionListRequestTest.php - Unit tests (10 tests, 32 assertions) for request parameters and JSON/PKI string generation

Documentation/Samples:

8. samples/list_transactions.php - Example usage demonstrating:
   • Manual pagination (single page)
   • Automatic pagination (all pages using Generator)
   • Pagination with filters

Key Features Added

1. Memory-Efficient Pagination with PHP Generators

• The listAll() method uses PHP Generators to stream results page-by-page
• Avoids loading all transactions into memory at once
• Enables processing of large datasets (thousands of transactions) efficiently
• Usage: foreach ($resource->listAll($request) as $transaction) { /* process */ }

2. Rich Pagination Metadata

All pagination responses include:

• currentPage - Current page number
• totalPages - Total number of pages available
• pageSize - Number of records per page
• totalRecords - Total number of records across all pages
• hasNextPage() - Boolean helper method
• hasPreviousPage() - Boolean helper method

3. Sensible Defaults

• Default page size: 100 records (configurable)
• Default page: 1 (if not specified)
• Automatic initialization of pagination parameters

4. Enhanced Error Handling

• Pagination state included in exception messages for debugging
• Example: "Authentication failed (page: 2, page_size: 50)"
• Helps identify which page/request failed during automatic pagination

5. Flexible Filtering

Request supports multiple filter combinations:

• Date ranges (startDate, endDate)
• Transaction status (status)
• Order reference (orderReference)
• Pagination controls (page, pageSize)

6. API Compliance

Follows existing SDK patterns:

• Extends SipayResource base class
• Uses mapper pattern for response parsing
• Returns self for method chaining (fluent interface)
• Proper type hints and strict types (declare(strict_types=1))
• PSR-4 autoloading compliant

Testing

All tests pass successfully with comprehensive coverage:

TransactionListTest (11 tests, 371 assertions)

✅ Empty results handling
✅ Single page with 2 transactions
✅ Multiple pages - first page (hasNextPage=true)
✅ Multiple pages - middle page (hasNextPage=true, hasPreviousPage=true)
✅ Multiple pages - last page (hasNextPage=false)
✅ Default pagination parameters (page=1, pageSize=100)
✅ Request filters application
✅ listAll() with empty results
✅ listAll() with single page (50 transactions)
✅ listAll() with multiple pages (250 transactions across 3 pages)
✅ Error handling includes pagination state in exception message

TransactionListRequestTest (10 tests, 32 assertions)

✅ All getter/setter methods for pagination parameters
✅ JSON object generation with all parameters
✅ JSON object generation with minimal parameters
✅ PKI request string generation
✅ Fluent interface verification

Full Test Suite

vendor/bin/phpunit tests/ --no-coverage
PHPUnit 9.6.29 by Sebastian Bergmann and contributors.
OK (45 tests, 541 assertions)

Code Style Compliance

All code formatted using PHP CS Fixer according to project standards:

composer cs-fix
Fixed 2 of 137 files - All style issues resolved

Edge Cases Tested

• ✅ Empty result sets (0 pages, 0 records)
• ✅ Single page with partial results
• ✅ Multiple pages with exact page size boundaries
• ✅ Last page with fewer records than page size
• ✅ API errors during pagination (with state preservation)
• ✅ Null/unset pagination parameters (defaults applied)

The implementation is production-ready, fully tested, and follows all PHP 7.4+ best practices with strict typing throughout.