Update "ALL" Products

Hi there,
Is there a way to easily import newly added products from a shopify collection that I previously imported too?
I also need an easy way to quickly update all products to sync up with shopify as well.

Our shopify store gets updated every 3 days and I need to push over new products to our WP store after this. Old products often get updated with new prices and photos and I need to update existing products in WP as well.