Define buy_ticket interface in interfaces.rs

[Akshola00]

Description

Add fn buy_ticket(env: Env, event_id: BytesN<32>, buyer: Address, amount: i128).

Testing Requirements

Ensure traits compile.

• Crucial: Ensure all standard GitHub CI checks pass before submitting your PR!

Links

• See contributor.md for guidelines.

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

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