Buliding MobileApp For onlie order

i want a mobile android App for taking online orders of printing from our customers
And App Like vistaprint
Minimum size and very fastest app
Need Product Display
chatbott with our customization replies
paymnet links with degital payemnt sources Gpay, phone pay internet banking etc.
notifications options
Special Product Requesting
Payment linking options
Back End Managment option for order and customer managment