- Implemented WHMCS invoice creation and payment capture in SimManagementService for top-ups.
- Updated top-up logic to calculate costs based on GB input, with pricing set at 500 JPY per GB.
- Simplified the Top Up Modal interface, removing unnecessary fields and improving user experience.
- Added new methods in WhmcsService for invoice and payment operations.
- Enhanced error handling for payment failures and added transaction logging for audit purposes.
- Updated documentation to reflect changes in the SIM management flow and API interactions.
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