Implement accounting export for subscription transactions

[Smartdevs17]

Description

Build an accounting export system that generates formatted reports of all subscription transactions (invoices, payments, refunds, credits) for integration with accounting software.

Acceptance Criteria

• Export formats: CSV, JSON, QuickBooks, Xero
• Configurable date range and filter options
• Transaction categorization (revenue, refund, credit, fee)
• Deferred revenue calculation for GAAP compliance
• Scheduled automatic exports
• Export history with re-download

Technical Scope

• src/services/accountingExport.ts
• src/screens/AccountingExportScreen.tsx
• src/store/accountingStore.ts
• backend/services/
• Edge: large dataset export (streaming), encoding issues, reconciliation mismatches

[DevSolex]

@DevSolex has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hi Maintainer,

I’m a smart contract and full-stack developer interested in contributing to this issue. I’m an experienced contributor with hands-on experience in Rust, Soroban, Cairo, and TypeScript.

I’m passionate about building secure and scalable blockchain solutions, with a strong focus on writing clean, maintainable code. Based on the scope of this issue, I’m confident I can deliver a complete solution within 24 hours of assignment(ETA).
I would appreciate the opportunity to contribute and help move this forward.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @DevSolex to this issue.

[drips-wave]

Congratulations, @DevSolex! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

🧑‍💻 @DevSolex: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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[drips-wave]

This issue has been completed by @DevSolex as part of the Stellar Wave Program's 5th Wave 🥳

😎 @DevSolex: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here. You can also Leave a review to share your experience working on this issue.

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