20 Jul 2026
5 min.Pay SDK for Developers: Everything About RuStore’s New Payment Solution
Content
Integrating payments is one of the key stages in app development: dozens of scenarios, managing purchases, errors, subscriptions, and coupons. It's crucial that everything works stably and scales with your product.
RuStore's Pay SDK simplifies this process by providing developers with ready-made tools for accepting payments, managing subscriptions, coupons, and refunds—all without unnecessary dependencies or complex configurations.
In this article, we'll explore how Pay SDK works, who it's for, and what opportunities it unlocks for games, services, and apps.
Why Pay SDK?
Pay SDK is more than just a payment solution—it's a comprehensive infrastructure tool from VK that helps establish stable monetization across stores without requiring complex custom development or manual coding.
The SDK provides VK ID authorization, enables storing payment methods and transaction history, and leverages payment links between VK products. If a user has already made a payment in another product within the ecosystem, they won't need to re-enter their card details. This makes integration seamless while creating a shorter, safer user journey.
Key Benefits of Pay SDK
- Lightweight integration — no complex configurations or dependencies
- Support for various payment scenarios — from one-time purchases to two-stage payments
- API-based request handling — for server-side validation of payments and subscriptions
- Developer payload support — via API and Console, allowing flexible transmission and processing of additional order data
- Server-side notifications (callbacks) — send payment status updates to developers
- Support for large product catalogs and subscriptions
- Payment capability for unauthorized users — to maintain conversion rates
- Coupon support
- Simplified purchase and error handling — through unified interfaces
Who Is Pay SDK For?
Pay SDK is suitable for developers and studios of all sizes—from indie projects to large-scale services. It helps establish stable monetization without complex customizations and enables payment systems to scale as your product grows.
The SDK is especially useful for:
- Game developers working with in-app purchases, freemium models, and subscriptions
- Projects that need to accept payments from unauthorized users to boost conversion
- Developers using Kotlin, Java, Flutter, Unity, React Native, Defold, Godot, and Unreal Engine who want an official SDK with regular updates and support
Key Features of Pay SDK
Pay SDK brings together everything needed to accept payments in mobile apps and games—from flexible payment scenarios to unified purchase tracking. It's designed to minimize integration time while supporting various monetization models without requiring extensive custom work.
Simple Integration
Pay SDK is configured directly in AndroidManifest.xml and doesn't require third-party libraries with extensive dependencies. This allows you to quickly start accepting payments without complex setups or additional code.
Flexible Payment Scenarios
Pay SDK supports both immediate debits and two-stage transactions with fund holds. This approach enables server-side actions before the actual charge—such as verifying an order or confirming product availability—and only completing payment afterward. If the operation can't be completed, the hold is released without incurring commission fees.
Scalable Product Catalog
A single SDK call can process up to 1,000 products—ideal for apps with large catalogs or numerous subscriptions.
Payments Without Authorization
Pay SDK supports payments from users who aren't logged in to RuStore, shortening the path to purchase and improving conversion rates.
Coupon Support
Pay SDK works with partial payments, making it easy to implement marketing campaigns and loyalty programs.
Simplified Error Handling
A unified interface for cancellations and errors—OnFailureListener—helps reduce logic duplication and speeds up debugging.
Versatility
Pay SDK can be used not only in apps published on RuStore but also in other app stores.
Integration Recommendations
To ensure Pay SDK runs reliably and without errors, it's important to properly configure your environment and test integration before release. Below are the key steps to focus on.
DeepLink Configuration
To support alternative payment methods (such as SBP, SberPay, etc.), you must define a DeepLink scheme in AndroidManifest.xml. This allows users to complete payment in an external app and return seamlessly without losing context.
Compatibility and Platforms
Pay SDK supports popular game engines and frameworks. It's recommended to add dependencies only from official Maven and GitFlic repositories to ensure you're always using the latest stable and verified version of the SDK.
Testing
RuStore provides a test mode: through the Developer Console, you can enable test payments for specific users, run purchases via the SDK, and verify that everything works correctly before publishing your app.
What's Next
The RuStore team is continuously developing Pay SDK. Future plans include adding new payment methods and improving customization and integration tools.
Special focus is placed on SDK stability, documentation quality, and comprehensive code examples to ensure integration remains straightforward even for complex use cases.
Conclusion
Pay SDK is more than just a payment tool—it's a foundation for monetization. It saves time, reduces technical risk, and allows your team to focus on the product rather than payment infrastructure.
To learn more about using Pay SDK in real-world projects, check out the RuStore On Air #1 meetup session.
