Local Pickup Plus

Hi, I wanted to know two things:

1) Can I indicate the availability of each individual product in each store?

2) once the sale has been made, is the availability of the product at the point of sale where the collection was made automatically deducted?

3) Can the customer who decides to collect the product in the shop from the site decide whether to pay directly in the shop or must he pay on the site?

A thousand thanks!