Integrating DoorDash/GrubHub/UberEats

Square has a feature that allows me to use DoorDash for fulfillment, unfortuantely due to a bug, this feature isn't available in my region.  Does Squarespace allow me to use third party immediate delivery services like DoorDash / UberEats for fulfillment? Thanks in advance.

I am working on a site (that is not live yet) for a food cart business. The owner has two locations, with the same menu at both. Here is what I'm dealing with: 

First, I created a menu and when checking out, customers have the option to pickup at either location. However, I am unable to find a way to automatically print an order to the specific location once it is placed. After much research, I am not seeing any kind of workaround for this, but I figured I'd ask here anyway. 

Second, I wanted to have a menu that people can add the items (with quantity) to cart, plus make any modifications they need, without leaving the menu page. Is this possible or no? 

Third, if there is no way to solve the above issues, has anyone here ever done any kind of integration with GrubHub, UberEats, or DoorDash (or all 3)? 

Please help! Thank you!