Retrieves a list of purchase orders

query {
    purchaseOrders(
        since: 1 //int
        limit: 1 //int
        created_at: "string" //filter POs created in this day (format Y-m-d H:i:s) - eg: 2023-02-10 20:20:20
        from_created_at: "string" //filter POs create after this day (format Y-m-d H:i:s) - eg: 2023-02-10 20:20:20
        to_created_at: "string"  //filter POs create before this day (format Y-m-d H:i:s) - eg: 2023-03-10 20:20:20
        updated_at: "string" //filter POs updated in this day (format Y-m-d H:i:s) - eg: 2023-02-10 20:20:20
        from_updated_at: "string" //filter POs update after this day (format Y-m-d H:i:s) - eg: 2023-02-10 20:20:20
        to_updated_at: "string"  //filter POs update before this day (format Y-m-d H:i:s) - eg: 2023-03-10 20:20:20
    ) {
        purchase_order_id
        purchase_code
        po_date
        expected_date
        currency
        supplier_id
        supplier_name
        ship_to_name
        ship_to_address
        discount_label
        discount_amount
        tax_label
        tax_amount
        shipping_label
        shipping_amount
        status
        created_at
        updated_at
        items {
            purchase_order_product_id
            product_id
            variant_id
            inventory_item_id
            product_name
            product_sku
            product_supplier_sku
            variant_name
            product_image
            variant_image
            qty_ordered
            qty_received
            cost
            sales_price
        }
    }
}