Validate Promotions

{
    "valid": true,
    "promotions": [
        {
            "valid": true,
            "applicable_to": { // returns the list of order items to which the product-specific discount will be applied to, the list is empty if the discount is applied to the whole order
                "data": [],
                "total": 0,
                "data_ref": "data",
                "object": "list"
            },
            "inapplicable_to": { // returns the list of excluded order items to which the product-specific discount won't be applied to
                "data": [],
                "total": 0,
                "data_ref": "data",
                "object": "list"
            },
            "order": { // presents calculations of applied discounts and order total
                "amount": 180000,
                "discount_amount": 1000,
                "total_discount_amount": 1000,
                "total_amount": 179000,
                "applied_discount_amount": 1000,
                "total_applied_discount_amount": 1000,
                "items": [
                    {
                        "object": "order_item",
                        "product_id": "prod_f1r5Tpr0DuC7",
                        "quantity": 2,
                        "amount": 360000,
                        "price": 180000,
                        "subtotal_amount": 360000,
                        "product": {
                            "id": "prod_f1r5Tpr0DuC7",
                            "source_id": "test_prod_id_1",
                            "name": "Apple iPhone 8"
                        }
                    }
                ],
                "customer_id": null,
                "referrer_id": null,
                "object": "order"
            },
            "id": "promo_KTmj6j2TGjvKXiHBeesbyh4w",
            "name": "Spring Flashsale '21 level 1",
            "banner": "level 1",
            "discount": {
                "type": "AMOUNT",
                "effect": "APPLY_TO_ORDER",
                "amount_off": 1000
            },
            "start_date": "2021-04-20T00:00:00.000Z",
            "expiration_date": "2021-08-31T00:00:00.000Z",
            "campaign": { // returns details of a campaign to which the validated tier belongs
                "id": "camp_MqiHYL4bXXKdHheXQEAvShEU",
                "start_date": "2021-04-20T00:00:00.000Z",
                "expiration_date": "2021-08-31T00:00:00.000Z",
                "active": true,
                "object": "campaign"
            },
            "hierarchy": 2, // when customer qualifies for more than one promotion tier, hirarchy decides which can be applied
            "discount_amount": 1000,
            "applied_discount_amount": 1000,
            "metadata": {
                "channel": [
                    "L1",
                    "L2"
                ]
            },
            "object": "promotion_tier"
        }
    ]
}