For your app my offer:
1. front-end mobile app : ionic framework, react native.
language is Angular js typescript .
2. back-end part : Laravel, Codeigniter, NodeJS.
if you have already this part, dont need.
3. Database : Mysql, Firebase, Mongodb.
4. for API : rest api.
if you will use paypal or credit card, we can use restful api.
For you app my experience
For your app my offer:
1. front-end mobile app : ionic framework, react native.
language is Angular js typescript .
2. back-end part : Laravel, Codeigniter, NodeJS.
if you have already this part, dont need.
3. Database : Mysql, Firebase, Mongodb.
4. for API : rest api.
if you will use paypal or credit card, we can use restful api.
For you app my experience