This method is in Alpha and may change in the future.
Creates multiple products in a single request.
Supports partial success - some products may be created successfully while others fail.
Each result includes an itemMetadata object indicating success or failure with error details.
When handling failures, distinguish between validation errors which shouldn't be retried, and transient errors which can be retried. Only retry failed items, not the entire batch.
This method doesn't return any custom errors, but may return standard errors. Learn more about standard Wix errors.