041: Transaction Simulation for Validation

[bakarezainab]

#041: Transaction Simulation for Validation

Category: [CONTRACT]
Difficulty: ● MEDIUM
Tags: simulation, validation, pre-flight

Description

Implement a pre-submission simulation step for all payroll transactions. Use Horizon's simulation endpoint to catch errors (insufficient funds, invalid sequence) before broadcasting to the network.

Acceptance Criteria

• Every transaction simulated before submission.
• User receives clear error messages from simulation failures.
• Prevents wasted fees on failed on-chain transactions.