Get a merchant catalog and search variants in it

{
    "catalog": {
        "id": "63f5f1f77dabc3305f462344",
        "ownerMerchantId": "merchant123",
        "name": "Premium Products Catalog",
        "description": "Catalog containing premium products for merchant",
        "isEnabled": true,
        "assignedToSubAccountIds": []
    },
    "variants": [
        {
            "merchantCatalogId": "63f5f1f77dabc3305f462344",
            "sku": "SKU-12345",
            "merchantSku": "MERCH-SKU-12345",
            "merchantPrice": {
                "currencies": [
                    {
                        "amount": 49.99,
                        "currency": "USD"
                    }
                ],
                "amount": 49.99,
                "currency": "USD"
            },
            "skipImageManipulation": null,
            "productId": null,
            "decorations": [
                {
                    "area": "Front",
                    "width": 200,
                    "height": 300,
                    "dpi": 300,
                    "method": "DirectToGarment",
                    "price": {
                        "currencies": [
                            {
                                "amount": 49.99,
                                "currency": "USD"
                            }
                        ],
                        "amount": 0,
                        "currency": null
                    },
                    "printImage": {
                        "sourcePrintFileUrl": "https://example.com/images/front-print.png",
                        "imageUploadStatus": "Pending",
                        "imageUploadStatusDesc": "Queued for processing",
                        "ourPrintFileId": null,
                        "ourPrintFileUrl": null
                    }
                }
            ],
            "attributes": [
                {
                    "name": "Color",
                    "value": "Red"
                },
                {
                    "name": "Size",
                    "value": "Large"
                }
            ]
        },
        {
            "merchantCatalogId": "63f5f1f77dabc3305f462344",
            "sku": "SKU-67890",
            "merchantSku": "MERCH-SKU-67890",
            "merchantPrice": {
                "currencies": [
                    {
                        "amount": 49.99,
                        "currency": "USD"
                    }
                ],
                "amount": 49.99,
                "currency": "USD"
            },
            "skipImageManipulation": null,
            "productId": null,
            "decorations": [
                {
                    "area": "Back",
                    "width": 150,
                    "height": 200,
                    "dpi": 300,
                    "method": "Embroidery",
                    "price": {
                        "currencies": [
                            {
                                "amount": 49.99,
                                "currency": "USD"
                            }
                        ],
                        "amount": 0,
                        "currency": null
                    },
                    "printImage": {
                        "sourcePrintFileUrl": "https://example.com/images/back-print.png",
                        "imageUploadStatus": "Success",
                        "imageUploadStatusDesc": "File uploaded successfully",
                        "ourPrintFileId": "file-123456",
                        "ourPrintFileUrl": null
                    }
                }
            ],
            "attributes": null
        }
    ],
    "totalVariants": 10
}