pr: [Nightly Fix] - Bug - Guard Zero Amount Coupons

[jewel-claw]

What

Guard the coupon discount-percent calculation against zero payable amounts in the submission handler.

Why

When coupons are applied, the handler calculates a discount percentage by dividing by $amountToPay. That value can be zero in fully discounted or malformed requests, which can trigger a division-by-zero warning and break the submission flow.

Fix

• Only compute the derived discount percentage when the payable amount is greater than zero
• Leave the coupon line-item generation and discount totals unchanged

Confidence

High. The change is a small defensive guard in one location, and the modified file passes php -l.

[greptile-apps]

PR author is not in the allowed authors list.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (1 file)

• includes/Classes/SubmissionHandler.php - Fix is correct

The guard condition if ($amountToPay > 0) correctly prevents division-by-zero when the payable amount is zero. The $discountPercent variable remains at its initialized value of 0 when the guard is not satisfied, which is the expected behavior.

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_{Reviewed by minimax-m2.5-20260211 · 109,113 tokens}