CreateInvoiceRequest

{
    "customer_id": "string",
    "customer_email": "user@example.com",
    "customer_name": "string",
    "customer_address": "string",
    "customer_phone": "string",
    "currency": "GMD",
    "tax_rate": 0,
    "due_date": "2019-08-24T14:15:22Z",
    "notes": "string",
    "items": [
        {
            "product_id": "string",
            "description": "string",
            "quantity": 1,
            "unit_price": "100.00"
        }
    ],
    "is_draft": false,
    "metadata": {}
}