How to get core shipping methods in Commerce 2? How to save an order? Is there an equivalent function to commerce_shippingMethods-&gt;getAllCoreShippingMethods() in Commerce 2?

I can only find Commerce::getInstance()-&gt;getShippingMethods()-&gt;getAllShippingMethods();

I also cant find an equivalent to craft()-&gt;commerce_orders-&gt;saveOrder($order) anywhere.
Commerce::getInstance()-&gt;getShippingMethods()-&gt;getAllShippingMethods(); would be the functional equivilant of Commerce 1'scommerce_shippingMethods-&gt;getAllCoreShippingMethods() since it returns the the shipping methods defined in the database.

Commerce::getInstance()-&gt;getShippingMethods()-&gt;getAvailableShippingMethods(); will return the shipping methods in the database as well as any 3rd party defined shipping methods.