Search for items in a store.
id: The unique identifier of the product.title: The product title.description: The product description.product_type: The type/category of the product.tags: Array of tags associated with the product.options: Available product options.images: Array of product images.variants: Array of product variants, each containing:
id: The variant ID.title: The variant title.price: The variant price.SEARCH_SUCCESS: Search completed successfully with resultsNO_RESULTS_FOUND: Search completed but no results foundAUTH_MISSING: No API key providedINVALID_KEY: Invalid API keyBAD_REQUEST_ERROR: Invalid request parametersSTORE_NOT_FOUND: Store ID not foundFORBIDDEN: Not authorized to access storeINTERNAL_ERROR: Server error occurred