Array
(
    [payment_method] => COD
    [payment_method_title] => App
    [set_paid] => 1
    [billing] => Array
        (
            [first_name] => test
            [last_name] => 
            [address_1] => test 9876543210  ggn test undefined
            [address_2] => 
            [city] => ggn
            [state] => ggn
            [postcode] => 122001
            [country] => IN
            [email] => test@gmail.com
            [phone] => 9876543210
        )

    [shipping] => Array
        (
            [first_name] => test
            [last_name] => 
            [address_1] => test 9876543210  ggn test undefined
            [address_2] => 
            [city] => ggn
            [state] => ggn
            [postcode] => 122001
            [country] => IN
        )

    [line_items] => Array
        (
            [0] => Array
                (
                    [product_id] => 
                    [quantity] => 1
                )

        )

    [shipping_lines] => Array
        (
            [0] => Array
                (
                    [method_id] => flat_rate
                    [method_title] => Flat Rate
                    [total] => 10
                )

        )

)
{"code":"woocommerce_rest_required_product_reference","message":"Product ID or SKU is required.","data":{"status":400}}