[FUNCTION] implement `set_asset_fee_discount`

[Akshola00]

• Title: Reward certain assets with lower fees.
• Description: If a user donates in a specific token (e.g., NEVO token), the platform fee is reduced.
• Requirements:
  • Mapping of Asset -> Discount.
  • Test: Verify fee difference between a normal asset and a discounted one.

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[ayomideadeniran]

@ayomideadeniran has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

I'm a backend developer and I'd like to take this issue.
I understand the requirement — implement asset-based fee discount mapping and tests comparing discounted vs normal assets.

I’ll keep it clean and consistent with the codebase.

ETA: 1 day
Portfolio: https://knightsdev-portfolio.vercel.app/

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[mayasimi]

@mayasimi has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

I can solve this issue

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[Muhammadcodes112]

@Muhammadcodes112 has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

Hello I'd like to apply for this issue—I have experience implementing smart contract fee mechanisms and can create the asset-to-discount mapping with comprehensive tests.

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[vicajohn]

@vicajohn has applied to work on this issue as part of the Stellar Wave Program's 2nd wave.

I’m interested in contributing to this project and delivering well-structured, reliable work. I have experience working within existing codebases and focus on writing clear, maintainable code.

I’m eager to collaborate, learn from feedback, and contribute features that align with the project’s standards and goals.

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Congratulations, @vicajohn! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on February 26, 2026.

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