Looking to develop an add-on to our Shopify Website:

We delivery healthy food ([login to view URL]). We currently use two Shopify apps: 1- "Local Delivery" ([login to view URL]) so users can select a date and time frame for delivery and 2- We have developed another app ("Apolo" – which is hosted on our server) that charges a delivery cost depending on delivery location and items purchased. We want to add new functionalities and improve the current ones in a new app that replaces both previous apps. To summarize the new app will have the following features: 1. Allow customers to choose delivery dates and hours (have an option for immediate delivery that we can turn off manually or automatically based on the day/hour) or choose to pick up the product (which we can turn off or on). 2. Charge a delivery cost based on the amount purchased, the items selected, and the place of delivery (our current app Apolo already has this functionality, we just need to integrate it). 3. Allow us to set how many days/minutes before a customer can make a delivery order based on the products they have selected and have an inventory that we can update manually and automatically to track products so they become unavailable for delivery on the same day if they ran out of stock. Also shows on the product page and collection how many are left of that product for delivery today. Take into account that some “products” are packages composed of other products, this would have to be taken into account to calculate how many of these packages are left. 4. Create a pop up after adding to cart that gives the option to continue shopping (that bring you back to the last catalog you were browsing) or go to checkout. 5. Allow users to log in through Facebook or Google.