Money Converter

This tool performs PHP-to-IDR currency conversion for individuals and small businesses needing quick estimates. It accepts an amount in PHP and returns the equivalent in IDR, using either current market rates or a user-provided rate. It is suitable for budgeting, pricing, invoice preparation, and cross-border planning where Rupiah costs must be estimated from Philippine Peso values. It provides structured numeric outputs and a transparent rate reference to support auditing and reconciliation.
Conceptual workflow: currencies are treated as units with a defined rate relative to each other. When auto mode is selected, a rate source is queried and results may be cached to reduce external requests. If the source is unavailable, the calculation will fail with a data unavailability condition and guidance to retry. In manual mode, the user provides a rate, which is validated for positivity and formatted to two decimal places before use.
Outputs include converted_amount, rate_used, and timestamp. Rounding rules apply: IDR results are rounded to whole Rupiah, PHP results to two decimals. Validations verify amount > 0 and valid currency codes. Edge cases cover missing inputs, unsupported currencies, or rate source failures. Assumptions include ISO 4217 currency codes and the availability of rate data; the tool can be extended to include additional currencies or alternate rate providers.