Agrupando e organizando dados usando FOR JSON PATH e INCLUDE_NULL_VALUES

Vou ignorar o dano cerebral de entender o esquema inteiro. Acho que essa abordagem vai agrupar as coisas da maneira que você quiser. Achei que JSON_QUERY() não deveria escapar as aspas nas chaves e valores no JSON aninhado, mas ainda as recebo quando executo isso. Provavelmente deixei passar algo aí.

SELECT 
      o.batch_code
    , o.amount_to_pay
    , CASE 
        WHEN o.batch_code IS NULL 
        THEN JSON_QUERY((
            SELECT 
                  oo.batch_code 
                , oo.order_id
                , p.prod_name
                , COALESCE(p.disc_price, sp.disc_price) as disc_price
            FROM @Orders as oo
            LEFT OUTER JOIN @Product as p
                ON oo.prod_id = p.prod_id
            LEFT OUTER JOIN @SubProduct as sp
                ON oo.prod_var_id = sp.prod_var_id
            WHERE o.order_id = oo.order_id
            FOR JSON PATH,
            INCLUDE_NULL_VALUES
        ))
        ELSE JSON_QUERY((
            SELECT 
                  oo.batch_code 
                , oo.order_id
                , p.prod_name
                , COALESCE(p.disc_price, sp.disc_price) as disc_price
            FROM @Orders as oo
            LEFT OUTER JOIN @Product as p
                ON oo.prod_id = p.prod_id
            LEFT OUTER JOIN @SubProduct as sp
                ON oo.prod_var_id = sp.prod_var_id
            WHERE o.batch_code = oo.batch_code
            FOR JSON PATH,
            INCLUDE_NULL_VALUES
        )) 
        END as nested_prod
FROM (
    SELECT o.order_id, o.batch_code, p.amount_to_pay
    FROM @Orders as o
    LEFT OUTER JOIN @Payment as p
        ON o.order_id = p.order_id
    WHERE batch_code IS NULL

    UNION 

    SELECT NULL as order_id, batch_code, SUM(p.amount_to_pay) as amount_to_pay
    FROM @Orders as o
    LEFT OUTER JOIN @Payment as p
        ON o.order_id = p.order_id
    WHERE batch_code iS not null
    GROUP BY o.batch_code
) as o
FOR JSON PATH,
INCLUDE_NULL_VALUES

A maneira como você tenta construir um JSON está correta: aninhar uma subconsulta FOR JSON PATH ou uma tabela unida na instrução SELECT gerará o texto JSON aninhado desejado. No entanto, existem alguns relacionamentos incorretos na sua amostra de dados, o que causa um resultado inesperado.

No meu entendimento:

• O nível mais externo da sua saída deve ser o objeto BATCH, que é agregado da tabela @orders que possui o mesmo batch_code. Presumo que pedidos com o mesmo valor de batch_code também tenham os mesmos valores de stat_ref_id, disable, user_id e dt_stamp. Para que eu possa incluir essas colunas em um conjunto de dados, chamo-o de batches.

• The BATCH object also has a property amount_to_pay, observe the sample data, it should be the value of sum(disc_price * quantity) of the orders with same value of batch_code. In your query, this value comes from the table @Payment, but in the table, column amount_to_pay is related to the @orders by order_id, it will repeating with @orders, so we need to add a new relationship to the dataset batched.

• The most importaint is object BATCH includes an array which contains object ORDER, it look like each ORDER has only one PRODUCT/SUBPRODUCT object, this must be a nested array in JSON. To impliment this, the CROSS APPLY must filter orders by batch_code.

If my understanding is correct, issues in your SQL script are:

• Your main query is based on table @orders, it has 6 validated rows, the top level of JSON result has to be a array contain 6 objects.

• The result you expect has 4 top level objects, If you aggregate the @orders by batch_code directly, NULL values make you cannot pass it into subquery and filter correct orders/products. We have to find a valid key column during aggregating to represent batch_id.

• The column amount_to_pay is come from table @Payment, but the only column can make relationship is order_id, if the main query JOIN with order_id will extend the rows either. We must add a key that can JOIN with the new batch_id in main query.

• The subquery of CROSS APPLY should filter the table @orders by batch_code, since the NULL value make this impossible, we need to add a batch_id in this @orders table as filter key too.

Of all the previous points, add a batch_id column in the @orders table is key.

• I think no batch number means only has one order, then I can treat the order_id as batch_code when the batch_code is null. So I building a CTE p_orders before the query, using IIF(batch_code IS NULL) to create a new column batch_id as key.

• Then I changing the main query to a nested query which SELECT DISTINCT batch_id and some columns as the dataset batches.

• I changing the dataset cnb to add a batch_id by JOIN the @Payment and the table p_orders.

• At last, I adding a JOIN p_tables in the subquery of CROSS APPLY to get columns value which must show in JSON, then filtering inner rows by the value of batch_id of the main query batches.

Code is here:

DECLARE @StatusRef TABLE(
    stat_ref_id VARCHAR(50) PRIMARY KEY NOT NULL,
    com_usd_wrds NVARCHAR(100) NOT NULL
);

DECLARE @Product TABLE(
    prod_id VARCHAR(50) PRIMARY KEY NOT NULL,
    prod_name VARCHAR(200) NOT NULL,
    stock INT NOT NULL,
    disc_price DECIMAL(12, 2) NOT NULL
);

DECLARE @SubProduct TABLE(
    prod_var_id VARCHAR(50) PRIMARY KEY NOT NULL,
    stock INT NOT NULL,
    disc_price DECIMAL(12, 2) NOT NULL,
    prod_id VARCHAR(50) NOT NULL
);

DECLARE @Orders TABLE(
    order_id VARCHAR(50) PRIMARY KEY NOT NULL,
    batch_code VARCHAR(50) NULL,
    quantity INT NOT NULL,
    stat_ref_id VARCHAR(50) NOT NULL,
    disable BIT DEFAULT (0) NOT NULL,
    dt_stamp DATETIME NOT NULL,
    prod_id VARCHAR(50) NULL,
    prod_var_id VARCHAR(50) NULL,
    user_id VARCHAR(50) NOT NULL
);

DECLARE @Payment TABLE(
    amount_to_pay DECIMAL(14, 2) NOT NULL,
    order_id VARCHAR(50) NOT NULL,
    disable BIT DEFAULT (0) NOT NULL
);

DECLARE @SubProductVarKeyValue TABLE(
    value VARCHAR(100) NOT NULL,
    prod_var_id VARCHAR(50) NOT NULL,
    pv_key_name_id VARCHAR(50) NOT NULL
);

DECLARE @SubProductVarKeyNames TABLE(
    pv_key_name_id VARCHAR(50) PRIMARY KEY NOT NULL,
    key_name VARCHAR(100) NOT NULL
);

INSERT INTO @StatusRef
VALUES
(
    'STAT-REF-1001', -- stat_ref_id
    'PENDING' -- com_usd_wrds
),
(
    'STAT-REF-1002', -- stat_ref_id
    'APPROVED' -- com_usd_wrds
),
(
    'STAT-REF-1003', -- stat_ref_id
    'PROCESSING' -- com_usd_wrds
);

INSERT INTO @Product
VALUES
(
    'PROD-ID-1001', -- prod_id
    'iPhone', -- prod_name
    0, -- stock | dependent to @SubProduct
    0.00 -- disc_price | dependent to @SubProduct
),
(
    'PROD-ID-1002', -- prod_id
    'Samsung', -- prod_name
    0, -- stock | dependent to @SubProduct
    0.00 -- disc_price | dependent to @SubProduct
),
(
    'PROD-ID-1003', -- prod_id
    'Nokia', -- prod_name
    75, -- stock
    33150.00 -- disc_price
),
(
    'PROD-ID-1004', -- prod_id
    'Google', -- prod_name
    100, -- stock
    53509.00 -- disc_price
),
(
    'PROD-ID-1005', -- prod_id
    'Sony', -- prod_name
    0, -- stock | dependent to @SubProduct
    0.00 -- disc_price | dependent to @SubProduct
),
(
    'PROD-ID-1006', -- prod_id
    'Lenovo', -- prod_name
    0, -- stock | dependent to @SubProduct
    0.00 -- disc_price | dependent to @SubProduct
);

INSERT INTO @SubProduct
VALUES
(
    'PROD-VAR-ID-1', -- prod_var_id
    25, -- stock
    45809.00, -- disc_price
    'PROD-ID-1001' -- prod_id
),
(
    'PROD-VAR-ID-2', -- prod_var_id
    50, -- stock
    40209.00, -- disc_price
    'PROD-ID-1002' -- prod_id
),
(
    'PROD-VAR-ID-3', -- prod_var_id
    0, -- stock | dependent to @Product
    0.00, -- disc_price | dependent to @Product
    'PROD-ID-1003' -- prod_id
),
(
    'PROD-VAR-ID-4', -- prod_var_id
    0, -- stock | dependent to @Product
    0.00, -- disc_price | dependent to @Product
    'PROD-ID-1004' -- prod_id
),
(
    'PROD-VAR-ID-5', -- prod_var_id
    125, -- stock
    25809.00, -- disc_price
    'PROD-ID-1005' -- prod_id
),
(
    'PROD-VAR-ID-6', -- prod_var_id
    150, -- stock
    49100.00, -- disc_price
    'PROD-ID-1006' -- prod_id
);

INSERT INTO @SubProductVarKeyValue
VALUES
(
    'new', -- value
    'PROD-VAR-ID-1', -- prod_var_id
    'PVKN-ID-1' -- pv_key_name_id
),
(
    'new', -- value
    'PROD-VAR-ID-2', -- prod_var_id
    'PVKN-ID-1' -- pv_key_name_id
),
(
    'new', -- value
    'PROD-VAR-ID-5', -- prod_var_id
    'PVKN-ID-1' -- pv_key_name_id
),
(
    'new', -- value
    'PROD-VAR-ID-6', -- prod_var_id
    'PVKN-ID-1' -- pv_key_name_id
)

INSERT INTO @SubProductVarKeyNames
VALUES
(
    'PVKN-ID-1', -- pv_key_name_id
    'Condition' -- key_name
)

INSERT INTO @Orders
(
    order_id,
    batch_code,
    quantity,
    stat_ref_id,
    dt_stamp,
    prod_id,
    prod_var_id,
    user_id
)
VALUES
(
    'ORDER-2025-04-11-B71D0E2F5D8C', -- order_id
    NULL, -- batch_code
    1, -- quantity
    'STAT-REF-1003', -- stat_ref_id
    '2025-04-14 10:17:20.963', -- dt_stamp
    NULL, -- prod_id
    'PROD-VAR-ID-1', -- prod_var_id
    'UGUID-2025-01-27-14-09-22-1967-ABCDEFGHIJKL' -- user_id
),
(
    'ORDER-2025-04-11-D95EB033CA40', -- order_id
    'BGUID-2025-04-11-6D81B58FAE94', -- batch_code
    2, -- quantity
    'STAT-REF-1001', -- stat_ref_id
    '2025-04-13 09:17:20.963', -- dt_stamp
    NULL, -- prod_id
    'PROD-VAR-ID-2', -- prod_var_id
    'UGUID-2025-01-27-14-09-22-1967-ABCDEFGHIJKL' -- user_id
),
(
    'ORDER-2025-04-11-7F04EFA2BB60', -- order_id
    'BGUID-2025-04-11-6D81B58FAE94', -- batch_code
    2, -- quantity
    'STAT-REF-1001', -- stat_ref_id
    '2025-04-13 09:17:20.963', -- dt_stamp
    'PROD-ID-1003', -- prod_id
    NULL, -- prod_var_id
    'UGUID-2025-01-27-14-09-22-1967-ABCDEFGHIJKL' -- user_id
),
(
    'ORDER-2025-04-10-3F03EAA47686', -- order_id
    'BGUID-2025-04-10-20239FD2059F', -- batch_code
    1, -- quantity
    'STAT-REF-1002', -- stat_ref_id
    '2025-04-12 08:17:20.963', -- dt_stamp
    'PROD-ID-1004', -- prod_id
    NULL, -- prod_var_id
    'UGUID-2025-01-27-14-09-22-1967-ABCDEFGHIJKL' -- user_id
),
(
    'ORDER-2025-04-10-F4A89E2C4A30', -- order_id
    'BGUID-2025-04-10-20239FD2059F', -- batch_code
    1, -- quantity
    'STAT-REF-1002', -- stat_ref_id
    '2025-04-12 08:17:20.963', -- dt_stamp
    NULL, -- prod_id
    'PROD-VAR-ID-5', -- prod_var_id
    'UGUID-2025-01-27-14-09-22-1967-ABCDEFGHIJKL' -- user_id
),
(
    'ORDER-2025-04-08-31BD887341FA', -- order_id
    NULL, -- batch_code
    1, -- quantity
    'STAT-REF-1001', -- stat_ref_id
    '2025-04-11 07:17:20.963', -- dt_stamp
    NULL, -- prod_id
    'PROD-VAR-ID-6', -- prod_var_id
    'UGUID-2025-01-27-14-09-22-1967-ABCDEFGHIJKL' -- user_id
);

INSERT INTO @Payment
(
    amount_to_pay,
    order_id
)
VALUES
(
    45809.00, -- amount_to_pay
    'ORDER-2025-04-11-B71D0E2F5D8C' -- order_id
),
(
    146718.00, -- amount_to_pay
    'ORDER-2025-04-11-D95EB033CA40' -- order_id
),
(
    146718.00, -- amount_to_pay
    'ORDER-2025-04-11-7F04EFA2BB60' -- order_id
),
(
    79318.00, -- amount_to_pay
    'ORDER-2025-04-10-3F03EAA47686' -- order_id
),
(
    79318.00, -- amount_to_pay
    'ORDER-2025-04-10-F4A89E2C4A30' -- order_id
),
(
    49100.00, -- amount_to_pay
    'ORDER-2025-04-08-31BD887341FA' -- order_id
);

DECLARE @user_id VARCHAR(50) = 'UGUID-2025-01-27-14-09-22-1967-ABCDEFGHIJKL'; -- FOR TESTING PURPOSES ONLY
DECLARE @status_t TABLE (status VARCHAR(50));
INSERT INTO @status_t VALUES ('PENDING'),('APPROVED'),('PROCESSING')
;
WITH p_orders
AS
(
    SELECT IIF(o.batch_code IS NULL, o.order_id, o.batch_code) as batch_id, o.* FROM @orders o
)
SELECT
    batchs.batch_code AS 'batch_code', -- FOR DEMONSTRATION PURPOSES ONLY
    oa_prod.nested_data AS 'nested_prod',
    cnb.amount_to_pay AS 'amount_to_pay'
FROM
(
    SELECT DISTINCT batch_id, batch_code, stat_ref_id, disable, user_id, dt_stamp FROM p_orders 
)batchs
RIGHT OUTER JOIN
(
    SELECT DISTINCT o.batch_id, p.amount_to_pay, p.disable FROM p_orders o
    INNER JOIN @Payment p
    ON o.order_id = p.order_id
)cnb
ON
    batchs.batch_id = cnb.batch_id
LEFT OUTER JOIN
    @StatusRef AS stat_ref
ON
    batchs.stat_ref_id = stat_ref.stat_ref_id
CROSS APPLY
(
    SELECT
        orders.batch_code,
        orders.order_id,
        prod.prod_name,
        pv_kn.key_name,
        pv_kv.value,
        CASE WHEN
            orders.prod_id IS NOT NULL
        THEN
            prod.disc_price
        WHEN
            orders.prod_var_id IS NOT NULL
        THEN
            prod_var.disc_price
        END AS disc_price,
        orders.quantity
    FROM
        @Product AS prod
    RIGHT OUTER JOIN
        @SubProduct AS prod_var
    ON
        prod.prod_id = prod_var.prod_id
    INNER JOIN p_orders orders
    ON prod.prod_id = orders.prod_id 
        OR prod_var.prod_var_id = orders.prod_var_id
    LEFT OUTER JOIN
        @SubProductVarKeyValue AS pv_kv
    ON
        prod_var.prod_var_id = pv_kv.prod_var_id
    LEFT OUTER JOIN
        @SubProductVarKeyNames AS pv_kn
    ON
        pv_kv.pv_key_name_id = pv_kn.pv_key_name_id
    WHERE       
        orders.batch_id = batchs.batch_id
    FOR JSON PATH,
    INCLUDE_NULL_VALUES
)AS oa_prod(nested_data)
WHERE
    batchs.disable = 0
    AND cnb.disable = 0
    AND batchs.user_id = @user_id
    AND stat_ref.com_usd_wrds IN (SELECT status FROM @status_t)
ORDER BY
    batchs.dt_stamp DESC
FOR JSON PATH,
INCLUDE_NULL_VALUES

Code without CTE:

DECLARE @StatusRef TABLE(
    stat_ref_id VARCHAR(50) PRIMARY KEY NOT NULL,
    com_usd_wrds NVARCHAR(100) NOT NULL
);

DECLARE @Product TABLE(
    prod_id VARCHAR(50) PRIMARY KEY NOT NULL,
    prod_name VARCHAR(200) NOT NULL,
    stock INT NOT NULL,
    disc_price DECIMAL(12, 2) NOT NULL
);

DECLARE @SubProduct TABLE(
    prod_var_id VARCHAR(50) PRIMARY KEY NOT NULL,
    stock INT NOT NULL,
    disc_price DECIMAL(12, 2) NOT NULL,
    prod_id VARCHAR(50) NOT NULL
);

DECLARE @Orders TABLE(
    order_id VARCHAR(50) PRIMARY KEY NOT NULL,
    batch_code VARCHAR(50) NULL,
    quantity INT NOT NULL,
    stat_ref_id VARCHAR(50) NOT NULL,
    disable BIT DEFAULT (0) NOT NULL,
    dt_stamp DATETIME NOT NULL,
    prod_id VARCHAR(50) NULL,
    prod_var_id VARCHAR(50) NULL,
    user_id VARCHAR(50) NOT NULL
);

DECLARE @Payment TABLE(
    amount_to_pay DECIMAL(14, 2) NOT NULL,
    order_id VARCHAR(50) NOT NULL,
    disable BIT DEFAULT (0) NOT NULL
);

DECLARE @SubProductVarKeyValue TABLE(
    value VARCHAR(100) NOT NULL,
    prod_var_id VARCHAR(50) NOT NULL,
    pv_key_name_id VARCHAR(50) NOT NULL
);

DECLARE @SubProductVarKeyNames TABLE(
    pv_key_name_id VARCHAR(50) PRIMARY KEY NOT NULL,
    key_name VARCHAR(100) NOT NULL
);

INSERT INTO @StatusRef
VALUES
(
    'STAT-REF-1001', -- stat_ref_id
    'PENDING' -- com_usd_wrds
),
(
    'STAT-REF-1002', -- stat_ref_id
    'APPROVED' -- com_usd_wrds
),
(
    'STAT-REF-1003', -- stat_ref_id
    'PROCESSING' -- com_usd_wrds
);

INSERT INTO @Product
VALUES
(
    'PROD-ID-1001', -- prod_id
    'iPhone', -- prod_name
    0, -- stock | dependent to @SubProduct
    0.00 -- disc_price | dependent to @SubProduct
),
(
    'PROD-ID-1002', -- prod_id
    'Samsung', -- prod_name
    0, -- stock | dependent to @SubProduct
    0.00 -- disc_price | dependent to @SubProduct
),
(
    'PROD-ID-1003', -- prod_id
    'Nokia', -- prod_name
    75, -- stock
    33150.00 -- disc_price
),
(
    'PROD-ID-1004', -- prod_id
    'Google', -- prod_name
    100, -- stock
    53509.00 -- disc_price
),
(
    'PROD-ID-1005', -- prod_id
    'Sony', -- prod_name
    0, -- stock | dependent to @SubProduct
    0.00 -- disc_price | dependent to @SubProduct
),
(
    'PROD-ID-1006', -- prod_id
    'Lenovo', -- prod_name
    0, -- stock | dependent to @SubProduct
    0.00 -- disc_price | dependent to @SubProduct
);

INSERT INTO @SubProduct
VALUES
(
    'PROD-VAR-ID-1', -- prod_var_id
    25, -- stock
    45809.00, -- disc_price
    'PROD-ID-1001' -- prod_id
),
(
    'PROD-VAR-ID-2', -- prod_var_id
    50, -- stock
    40209.00, -- disc_price
    'PROD-ID-1002' -- prod_id
),
(
    'PROD-VAR-ID-3', -- prod_var_id
    0, -- stock | dependent to @Product
    0.00, -- disc_price | dependent to @Product
    'PROD-ID-1003' -- prod_id
),
(
    'PROD-VAR-ID-4', -- prod_var_id
    0, -- stock | dependent to @Product
    0.00, -- disc_price | dependent to @Product
    'PROD-ID-1004' -- prod_id
),
(
    'PROD-VAR-ID-5', -- prod_var_id
    125, -- stock
    25809.00, -- disc_price
    'PROD-ID-1005' -- prod_id
),
(
    'PROD-VAR-ID-6', -- prod_var_id
    150, -- stock
    49100.00, -- disc_price
    'PROD-ID-1006' -- prod_id
);

INSERT INTO @SubProductVarKeyValue
VALUES
(
    'new', -- value
    'PROD-VAR-ID-1', -- prod_var_id
    'PVKN-ID-1' -- pv_key_name_id
),
(
    'new', -- value
    'PROD-VAR-ID-2', -- prod_var_id
    'PVKN-ID-1' -- pv_key_name_id
),
(
    'new', -- value
    'PROD-VAR-ID-5', -- prod_var_id
    'PVKN-ID-1' -- pv_key_name_id
),
(
    'new', -- value
    'PROD-VAR-ID-6', -- prod_var_id
    'PVKN-ID-1' -- pv_key_name_id
)

INSERT INTO @SubProductVarKeyNames
VALUES
(
    'PVKN-ID-1', -- pv_key_name_id
    'Condition' -- key_name
)

INSERT INTO @Orders
(
    order_id,
    batch_code,
    quantity,
    stat_ref_id,
    dt_stamp,
    prod_id,
    prod_var_id,
    user_id
)
VALUES
(
    'ORDER-2025-04-11-B71D0E2F5D8C', -- order_id
    NULL, -- batch_code
    1, -- quantity
    'STAT-REF-1003', -- stat_ref_id
    '2025-04-14 10:17:20.963', -- dt_stamp
    NULL, -- prod_id
    'PROD-VAR-ID-1', -- prod_var_id
    'UGUID-2025-01-27-14-09-22-1967-ABCDEFGHIJKL' -- user_id
),
(
    'ORDER-2025-04-11-D95EB033CA40', -- order_id
    'BGUID-2025-04-11-6D81B58FAE94', -- batch_code
    2, -- quantity
    'STAT-REF-1001', -- stat_ref_id
    '2025-04-13 09:17:20.963', -- dt_stamp
    NULL, -- prod_id
    'PROD-VAR-ID-2', -- prod_var_id
    'UGUID-2025-01-27-14-09-22-1967-ABCDEFGHIJKL' -- user_id
),
(
    'ORDER-2025-04-11-7F04EFA2BB60', -- order_id
    'BGUID-2025-04-11-6D81B58FAE94', -- batch_code
    2, -- quantity
    'STAT-REF-1001', -- stat_ref_id
    '2025-04-13 09:17:20.963', -- dt_stamp
    'PROD-ID-1003', -- prod_id
    NULL, -- prod_var_id
    'UGUID-2025-01-27-14-09-22-1967-ABCDEFGHIJKL' -- user_id
),
(
    'ORDER-2025-04-10-3F03EAA47686', -- order_id
    'BGUID-2025-04-10-20239FD2059F', -- batch_code
    1, -- quantity
    'STAT-REF-1002', -- stat_ref_id
    '2025-04-12 08:17:20.963', -- dt_stamp
    'PROD-ID-1004', -- prod_id
    NULL, -- prod_var_id
    'UGUID-2025-01-27-14-09-22-1967-ABCDEFGHIJKL' -- user_id
),
(
    'ORDER-2025-04-10-F4A89E2C4A30', -- order_id
    'BGUID-2025-04-10-20239FD2059F', -- batch_code
    1, -- quantity
    'STAT-REF-1002', -- stat_ref_id
    '2025-04-12 08:17:20.963', -- dt_stamp
    NULL, -- prod_id
    'PROD-VAR-ID-5', -- prod_var_id
    'UGUID-2025-01-27-14-09-22-1967-ABCDEFGHIJKL' -- user_id
),
(
    'ORDER-2025-04-08-31BD887341FA', -- order_id
    NULL, -- batch_code
    1, -- quantity
    'STAT-REF-1001', -- stat_ref_id
    '2025-04-11 07:17:20.963', -- dt_stamp
    NULL, -- prod_id
    'PROD-VAR-ID-6', -- prod_var_id
    'UGUID-2025-01-27-14-09-22-1967-ABCDEFGHIJKL' -- user_id
);

INSERT INTO @Payment
(
    amount_to_pay,
    order_id
)
VALUES
(
    45809.00, -- amount_to_pay
    'ORDER-2025-04-11-B71D0E2F5D8C' -- order_id
),
(
    146718.00, -- amount_to_pay
    'ORDER-2025-04-11-D95EB033CA40' -- order_id
),
(
    146718.00, -- amount_to_pay
    'ORDER-2025-04-11-7F04EFA2BB60' -- order_id
),
(
    79318.00, -- amount_to_pay
    'ORDER-2025-04-10-3F03EAA47686' -- order_id
),
(
    79318.00, -- amount_to_pay
    'ORDER-2025-04-10-F4A89E2C4A30' -- order_id
),
(
    49100.00, -- amount_to_pay
    'ORDER-2025-04-08-31BD887341FA' -- order_id
);

DECLARE @user_id VARCHAR(50) = 'UGUID-2025-01-27-14-09-22-1967-ABCDEFGHIJKL'; -- FOR TESTING PURPOSES ONLY
DECLARE @status_t TABLE (status VARCHAR(50));
INSERT INTO @status_t VALUES ('PENDING'),('APPROVED'),('PROCESSING')

SELECT
    batches.batch_code AS 'batch_code', -- FOR DEMONSTRATION PURPOSES ONLY
    oa_prod.nested_data AS 'nested_prod',
    cnb.amount_to_pay AS 'amount_to_pay'
FROM
(
    SELECT DISTINCT 
        IIF(o.batch_code IS NULL, o.order_id, o.batch_code) as batch_id, 
        batch_code, stat_ref_id, disable, user_id, dt_stamp FROM @orders o
)batches
RIGHT OUTER JOIN
(
    SELECT DISTINCT IIF(o.batch_code IS NULL, o.order_id, o.batch_code) as batch_id, 
        p.amount_to_pay, p.disable 
    FROM @orders o INNER JOIN @Payment p
    ON o.order_id = p.order_id
)cnb
ON
    batches.batch_id = cnb.batch_id
LEFT OUTER JOIN
    @StatusRef AS stat_ref
ON
    batches.stat_ref_id = stat_ref.stat_ref_id
CROSS APPLY
(
    SELECT
        orders.batch_code,
        orders.order_id,
        prod.prod_name,
        pv_kn.key_name,
        pv_kv.value,
        CASE WHEN
            orders.prod_id IS NOT NULL
        THEN
            prod.disc_price
        WHEN
            orders.prod_var_id IS NOT NULL
        THEN
            prod_var.disc_price
        END AS disc_price,
        orders.quantity
    FROM
        @Product AS prod
    RIGHT OUTER JOIN
        @SubProduct AS prod_var
    ON
        prod.prod_id = prod_var.prod_id
    INNER JOIN 
    (
        SELECT IIF(o.batch_code IS NULL, o.order_id, o.batch_code) as batch_id, o.* FROM @orders o
    )AS orders
    ON prod.prod_id = orders.prod_id 
        OR prod_var.prod_var_id = orders.prod_var_id
    LEFT OUTER JOIN
        @SubProductVarKeyValue AS pv_kv
    ON
        prod_var.prod_var_id = pv_kv.prod_var_id
    LEFT OUTER JOIN
        @SubProductVarKeyNames AS pv_kn
    ON
        pv_kv.pv_key_name_id = pv_kn.pv_key_name_id
    WHERE       
        orders.batch_id = batches.batch_id
    FOR JSON PATH,
    INCLUDE_NULL_VALUES
)AS oa_prod(nested_data)
WHERE
    batches.disable = 0
    AND cnb.disable = 0
    AND batches.user_id = @user_id
    AND stat_ref.com_usd_wrds IN (SELECT status FROM @status_t)
ORDER BY
    batches.dt_stamp DESC
FOR JSON PATH,
INCLUDE_NULL_VALUES