Add SDK method for `setDistributionContract`

[Levi-Ojukwu]

Description:

The contract has set_distribution_contract but the SDK does not expose it.

Why it matters: Distribution contract configuration affects token rewards.

Acceptance Criteria:

• Create setDistributionContract(address) admin method
• Add tests

Relevant Files: contracts/invoice_liquidity/src/lib.rs:285-295, sdk/src/index.ts

---

[jaymoneymanxl]

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

Hi maintainer I would like to work on this issue, thank you.

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[Dhivine-stack]

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Hi, I've carefully gone through the issue details and am confident I can deliver a solution that meets all the stated requirements. Kindly assign it to me.

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[DeborahOlaboye]

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

Hello maintainer, I'd like to work on this issue.

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

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign | FWC26 campaign!

@DeborahOlaboye's PR #586 was approved and merged by @Levi-Ojukwu.

🏆 @DeborahOlaboye: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (617 total points). Track your full progress on GrantFox.

👏 Great work, @DeborahOlaboye! Keep contributing to Invoice-Liquidity-Network.

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

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