Add the SDK
One line in your package manager — Swift Package Manager, Gradle, or pub. No native build steps to wire up.
Quickstart
One SDK call. Live in a day.
Add the SDK, configure your publishable key, and call checkout — your existing App Store Connect and Play Console products sync automatically. No payment backend, no entitlement server, no catalog re-entry. Ships for iOS, Android, and Flutter.
The steps
Four steps from install to live
~1 day, one checkout call, three SDKs. No payment backend, no entitlement server, no catalog re-entry — the platform handles the parts you'd otherwise build.
Configure your key
Drop in your publishable key from the dashboard. That's the whole setup — the SDK fetches your catalog at runtime.
Call the checkout method
One method on the buy button. The SDK routes each purchase automatically — direct web checkout where it's allowed, StoreKit or Play Billing as a compliant fallback. Same call on every platform, no branching in your code.
Sync your store catalog
Your App Store Connect and Play Console products import automatically — no re-entering prices, IDs, or subscription groups.
The code
Configure, then checkout
Configure with your publishable key, then call checkout on the buy button. Same shape on iOS, Android, and Flutter.
import ZeroSettleKit
struct PaywallView: View {
@State var product: ZSProduct?
var body: some View {
Button("Upgrade to Pro") {
product = ZeroSettle.shared.product(for: "pro_monthly")
}
.checkoutSheet(item: $product) { result in
// done
}
}
.onAppear {
ZeroSettle.shared.configure(publishableKey: "zs_live_...")
}
}
import io.zerosettle.sdk
class PaywallActivity : ComponentActivity() {
override fun onCreate(state: Bundle?) {
ZeroSettle.configure("zs_live_...")
val product = ZeroSettle.product("pro_monthly")
setContent {
Button(onClick = { ZeroSettle.checkout(product) }) {
Text("Upgrade to Pro")
}
}
}
}
import 'package:zerosettle/zerosettle.dart';
class PaywallView extends StatelessWidget {
Widget build(BuildContext ctx) {
ZeroSettle.configure('zs_live_...');
final product = ZeroSettle.product('pro_monthly');
return ElevatedButton(
onPressed: () => ZeroSettle.checkout(product),
child: Text('Upgrade to Pro'),
);
}
}
What you don't build
Skip the infrastructure
The hard parts of mobile revenue are already built. You ship the buy button — the platform handles the rest.
No payment backend
No Stripe integration, no webhooks to host, no checkout server. The SDK call is the whole flow.
No entitlement server
One identity across StoreKit, Play Billing, and web. The platform keeps access in sync — no state to reconcile.
No tax engine
On the managed tier, ZeroSettle is the Merchant of Record — global tax calculation and remittance are handled for you.
No paywall A/B infra
Test prices, paywalls, and offers from the dashboard — stat-sig built in. No experimentation pipeline to stand up.
Start with one product
A calmer way to grow app revenue.
Connect your catalog, unify customer access, and launch your first pricing experiment — then turn on Autopilot when you’re ready to scale.