Is it possible to omit the parameters for VK retargeting?

Question

In contact with

Hello!
The customer says that you can not fill in the parameters:

recommended_ids(optional, ID of recommended products for a particular product or group of products),

group_id(optional, Product group. If the user is looking not for a specific model, but for all variants of a certain model.)

"products_recommended_ids" (//

List of recommended products, in the case when there are either no specific products, or you want to recommend some products without reference to specific products.) I want to additionally cover some category completely.)

As I understand it, optional is that they are optional, but what about "products_recommended_ids", "category_ids"? Can they be omitted when requested?
Another question about the event about the payment system:

<script>
window.vkAsyncInit = function() { 
  VK.Retargeting.ProductEvent(price_id, "add_payment_info", {});
  console.log('VK pixel event send: add_payment_info');
}
</script>

Here it is necessary to write anything at all in {}, I did not find the instruction. How will VK understand which system I use?

About buisness_value: from 1 to a million, are there any recommendations on what number to give, can I write any?
Thanks in advance!