Core: Implement Payment Request Expiration with Smart Contract Enforcement

[Smartdevs17]

Context

Payment requests can remain open indefinitely, leading to stale data, accounting confusion, and potential price exposure in volatile markets.

Current Limitation/Problem

Payment requests have no expiration mechanism. A request created at a specific exchange rate may be fulfilled days later at a very different rate, causing disputes.

Expected Outcome

Time-bound payment requests enforced both at the smart contract level (for on-chain payments) and backend level (for off-chain). Expired requests are automatically voided with proper event emissions.

Acceptance Criteria

• Configurable expiration per request (minutes, hours, days)
• Soroban contract enforces expiration during payment execution
• EVM contract enforces expiration for on-chain payments
• Backend rejects expired requests before relaying to chain
• Automatic status transition: pending -> expired
• Notification to requester and payer on expiration
• Expired request renewal with new rate calculation
• Dashboard filtering for expired requests

Technical Scope

• contracts/soroban/payment-request/src/ - expiration logic in Soroban
• contracts/evm/payment-request/src/ - expiration logic in EVM
• backend/src/services/payments/expiration.ts - backend enforcement
• Prisma: PaymentRequest add expiresAt, expiredAt fields
• BullMQ cron for expiration checking
• Frontend: expiration display and renewal UI
• Edge cases: block timestamp manipulation, timezone handling, grace periods

[Olasunkanmi975]

@Olasunkanmi975 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

I am ready to review the codebase, isolate the flaw, and deliver a clean, well-documented solution.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Olasunkanmi975 to this issue.

[Luchistack]

@Luchistack has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi! I’m a full-stack developer with a strong blockchain background. I’d love to handle this issue and can deliver a clean, reliable solution. Kindly assign it to me.

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

[rindicomfort]

@rindicomfort has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

hi,

Please I’d love to take this issue on. I’m a smart contract and full-stack developer with experience across OnlyDust, Drips Waves

My stack includes Rust, Soroban, Cairo, Solidity, and TypeScript. I can deliver a clean, tested, and well-documented solution within 24 hours of assignment.

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

[drips-wave]

Congratulations, @rindicomfort! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

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[drips-wave]

This issue has been completed by @rindicomfort as part of the Stellar Wave Program's 6th Wave 🥳

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