Implement Fee Discount System for High-Volume Merchants

[DanielEmmanuel1]

Description 📝

Introduce reduced fee rates for merchants who exceed specific processed volume thresholds.

Proposed Steps 📝

• Track cumulative volume per merchant.
• Apply discount in calculate_fee if volume > threshold.

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[firstJOASH]

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

i can solve this issue please assign me

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