An app becomes truly useful when it connects to the services people rely on. In Ghana that means letting users sign in, keeping their data safe in the cloud, taking payments by mobile money, and reaching them with notifications or SMS. Adverts we read asked for Firebase, third party integrations and push notifications, and some listed fintech experience or in app payments as a plus, so this section covers each one.
The golden rule: your app is not trusted
Everything you put inside an app can be unpacked and read by a determined person. Anyone can also change how their copy of the app behaves. So:
- Secrets such as payment provider keys and SMS provider keys must live on a server, never in the app.
- Important decisions, such as "this order is paid", must be made on the server, never by the app alone.
Your app talks to your own server or to a hosted backend with strict security rules. That server then talks to payment, SMS and other providers. Once you understand this rule, every integration in this section makes sense.
What this section covers
- Ready made backends and sign in. Using a hosted backend such as Firebase for user accounts, cloud data and server functions, without managing your own machines.
- Mobile money payments. How a payment travels between your app, your server, a payment provider and the customer's phone, and why the server must confirm every payment. This lesson stays provider neutral: the same pattern applies whichever provider a business chooses.