Point of Sale solution (POS) included in PrestaShop
Add a complete solution of Click & Collect in PrestaShop, with payment, in-store shipping service, ...) so that each retailer could use PrestaShop.
i think this noti an easy task. Because different countries have different laws for POS Sales and cash systems on POS. - Just have a look on the extremly differences in Austria, Germany, Italy, France and many more.
I am working on something similar by my own for my business (on PS 1.7.2). I am not a professional developer but I have some computer skills.
The module lets the customer choose the store (or any other points) where he(or she) can pick his products in a time slot.
Is it something like this you are looking for?