How do I design APIs for ABI stability for financial apps?

In designing APIs for ABI (Application Binary Interface) stability, particularly for financial applications, it's essential to focus on a few key principles. ABI stability ensures that changes or updates to the API do not break existing applications. This is critical in financial applications where reliability and consistency are paramount.

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// Example of designing a stable API class FinancialAPI { protected $version = "1.0"; // A method to retrieve account balance public function getAccountBalance($accountId) { // Implementation goes here return 1000.00; // Static value for example } // A new way of fetching transactions introduced in version 1.1 // This method preserves ABI by keeping previous methods intact public function getTransactions($accountId, $startDate, $endDate) { // Implementation goes here return [ ['date' => '2023-10-01', 'amount' => -100.00], ['date' => '2023-10-02', 'amount' => 500.00] ]; } } // Example usage $api = new FinancialAPI(); echo $api->getAccountBalance(12345); $transactions = $api->getTransactions(12345, '2023-10-01', '2023-10-31'); print_r($transactions);

ABI stability financial APIs API design application binary interface reliability consistency financial applications

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