Implement Payment Split Rules

[Shredder401k]

Type: Feature
Priority: High
Labels: feature, contracts, splitter

Description:
Add complex payment splitting rules and logic.

Features:

• Percentage-based splits
• Fixed amount splits
• Priority-based distribution
• Conditional rules
• Overflow handling

Acceptance Criteria:

• Split rules configurable
• Complex scenarios supported
• Accurate calculations
• All CI/CD checks must pass

---

[Babigdk]

Hi maintainers,

I'd like to work on this issue.

I have experience implementing backend and smart contract features across the Stellar/Soroban ecosystem, with a strong focus on correctness, testing, and maintainability. Before making changes, I review the existing architecture to ensure the implementation aligns with the project's conventions rather than introducing unnecessary complexity.

For this issue, I'll implement the requested functionality according to the acceptance criteria, add or update the necessary tests, and ensure all CI checks pass. I'll also document any important implementation decisions and keep the solution clean, modular, and easy to review.

If assigned, I'll begin immediately and provide a well-tested PR for review. Thank you!

[OpensrcLord]

Hello @maintainer, I understand the expected outcome and would love to work on this. I'll provide a solution that satisfies the acceptance criteria.

[oche2920]

Hey maintainer I can fix this pls assign to me

[grantfox-oss]

🦊 GrantFox — @oche2920 has been assigned to this issue as part of the Official Campaign | FWC26 campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #1380)
2. Your PR will be reviewed by the StellarStream-HQ maintainers

Good luck! Track your progress on GrantFox.