How to integrate payment system into a mobile app?

I am working on a food ordering app for a business. I have finished everything regarding the app and I am stuck on one thing. How to charge people for the food? When I use the Unity IAP I am not able to dynamically change the price for every order. I want to know an IAP service similar to Unity's which would allow me to change the price dynamically for every order.

 

because they are not meant to be used for that purpose, you could use apple pay instead https://developer.apple.com/apple-pay/

 

https://stripe.com/ is very nice. Also braintree which is paypals alternative is also appealing. But their API is much worse imo, they are basically ran by paypal and Uber as their main customer.

 

on google play and apple store you cannot use external payment solutions

 

Yes you can, just not for certain things. Such as in game content. At least for app store. Dont know there are restrictions on Google Play. If you can link the source

 

https://developer.apple.com/app-store/review/guidelines/#physical-goods-and-services
3.1.5 only apply to non physical items

 

I work for a company that sell non physical items through stripe on both iOS and Android

They only usually enforce it against virtual goods. But it can be seen as a Gamble, just like many things on the iOS platform.

 

So using apple pay I could charge people for what the order costs, not one price, and it can be a physical item.

 

well you can create an external link with a simple function in unity Application.OpenURL("your url in str") and can simply redirect to any external webpage for payment options.

 

are you sure ? sounds like they would ban an app doing that