Add parameter bounds validation in `update_config`

[Levi-Ojukwu]

Description:

The update_config function in config.rs:33-122 validates some parameters but leaves others unchecked:

• decay_rate_bps — not bounded; could be set to 10000 (100%), instantly zeroing all reputation scores
• decay_period_ledgers — not bounded; could be set to 0, causing division-by-zero in invoice.rs:324
• dispute_timeout_ledgers — not bounded; could be set to 0, allowing instant auto-resolution of disputes before the payer can respond
• high_rep_threshold — no bounds; could be set to 0, making all LPs "high reputation"

Why it matters: Malicious or misconfigured governance calls could break the reputation system, dispute resolution, or LP prioritization.

Acceptance Criteria:

• Add min/max bounds for decay_rate_bps (e.g., 1–5000 bps)
• Add min bound for decay_period_ledgers (e.g., ≥ 100 ledgers)
• Add min bound for dispute_timeout_ledgers (e.g., ≥ 1440 ledgers / ~1 day)
• Add validation that high_rep_threshold > 0
• Return specific error codes for each validation failure
• Add tests for each boundary condition

Relevant Files: contracts/invoice_liquidity/src/config.rs:33-122

---

[Sam-Rytech]

Hi maintainer

I'd like to work on this issue

[tobiadewola41-eng]

@tobiadewola41-eng has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

would like to work on this issue

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[KorexOnchain]

@KorexOnchain has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

I'll love to work on this issue

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[drips-wave]

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

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[KorexOnchain]

PR ready for review: #615

[drips-wave]

This issue has been completed by @KorexOnchain as part of the Stellar Wave Program's 7th Wave 🥳

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