Connecting an existing iOS and Android app to PayPal.

General information for the app: It is a mobile app, iOS (Swift) and Android (C+ I think-I can confirm this. Kind of development: Customization of existing app Description of every page/module: It is a mobile app, iOS (Swift) and Android (C+ I think-I can confirm this. The app is a messaging app for retail stores that delivers the stores text message to customers when they are near the store. App is complete but the existing developer is having some trouble connecting the app to paypal. Description of requirements/features: What I’m trying to accomplish with PayPal is merchants subscribe to service using PayPal subscription. They are able to send messages when subription is active but cannot when subscription is canceled. Here is what I think I’m looking for: https://github.com/paypal/PayPal-iOS-SDK#use-cases Extra notes: