Validate schedule params at proposal-creation time: amount_per_period >= MIN_AMOUNT, interval_secs within range, recipient != contract address, token passes validate_token

[thegreatfeez]

Smart Contract — New Feature

Summary

A recurring schedule's parameters must be validated before a proposal is accepted. This adds creation-time checks for amount, interval, recipient, and token, following the existing validation patterns.

Background

create_proposal in contracts/accord/src/lib.rs validates the recipient address, amount, and token before creating a proposal. The validate.rs module holds reusable validation helpers. The new recurring-payment proposal entrypoint must validate the schedule-specific parameters: amount per period, interval, recipient, and token.

What Needs to Be Done

1. Validate that amount_per_period is at least MIN_AMOUNT, following the existing amount check pattern.
2. Validate that interval_secs is within the range [MIN_INTERVAL_SECS, MAX_INTERVAL_SECS].
3. Validate that the recipient address is not the contract's own address.
4. Validate the token address through the existing validate_token helper.
5. Return the appropriate contract error for each validation failure.

Acceptance Criteria

• The proposal entrypoint rejects an amount below the minimum.
• It rejects intervals outside the allowed range.
• It rejects the contract's own address as recipient.
• It rejects an invalid token address.
• Each rejection returns a distinct error.
• The contract compiles.

Files to Look At

• contracts/accord/src/lib.rs — the proposal entrypoint with validation logic
• contracts/accord/src/validate.rs — existing validation helpers

Difficulty: Medium

[oluwadindodosimilenuotunfatasi]

@oluwadindodosimilenuotunfatasi has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello! I'd be glad to take full ownership of this issue from start to finish. I plan to approach it methodically, ensuring the implementation is solid and well-documented, and I'll follow up with a clear, high-quality pull request once the work is complete.

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

[Musab1258]

@Musab1258 has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

Hello maintainer,

I recently came across your project and would love to work on this issue. Could you please assign it to me?

I am a full-stack developer with hands-on experience building responsive, user-friendly interfaces, robust backends, and smart contracts.

My specific technical experience includes:

• Frontend: Building intuitive, responsive UIs (e.g., with React).
• Smart Contracts & Blockchain: Writing secure, scalable decentralized logic.
• Backend: Developing reliable server-side systems to tie everything together.

I enjoy writing clean, scalable code and am highly focused on improving overall user experience. I am a fast learner, highly motivated, and available to get started immediately.

I would appreciate the opportunity to contribute to your team and would be glad to discuss the next steps. Thank you for your time and consideration.

Best regards,

Musab Habeeb

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Musab1258 to this issue.

[drips-wave]

Congratulations, @Musab1258! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @Musab1258: 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.

Warning

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊