Implement submitOrder Method for Buy and Sell Orders

[AndreaDiazCorreia]

Description

Implement the order submission functionality following the Mostro protocol specification for creating new buy and sell orders.

Implementation Requirements

1. Implement submitOrder method:

async submitOrder(order: NewOrder): Promise<MostroMessage> {
  // Validation
  // Order creation
  // Event emission
}

2. Support both order types:

interface NewOrder {
  kind: OrderType;
  status: OrderStatus;
  amount?: number;
  fiat_code: string;
  fiat_amount: number;
  payment_method: string;
  premium: number;
  created_at: number;
}

Testing Requirements

describe('submitOrder', () => {
  it('should create valid sell orders');
  it('should create valid buy orders');
  it('should validate order parameters');
  it('should handle market rate orders');
  it('should handle fixed price orders');
  it('should emit proper events');
});

Acceptance Criteria

• Order creation works for both buy/sell
• Market rate orders supported
• Fixed price orders supported
• Parameter validation implemented
• Proper error handling
• Event emission working
• Tests passing

References

• New Sell Order Protocol
• New Buy Order Protocol