Commercial App: Card Payment Integration

I am developing a revenue-driven mobile application and my immediate priority is to embed a secure electronic payment module. The app must accept credit cards—Visa, MasterCard, Amex, and the usual suspects—through an in-app checkout that meets PCI-DSS guidelines. Whether you prefer integrating Stripe, Braintree, or an equivalent SDK, I’m open to the tool you know best, as long as it delivers friction-free authorisation, tokenisation, and refund handling.

The build can be in Flutter, React Native, or fully native for Android and iOS; choose what lets you ship a stable, well-tested release fastest. I already have product and cart screens ready, so you will focus on:

• Wiring the checkout flow to the existing UI
• Configuring a sandbox environment for test cards
• Exposing clear configuration keys for switching to live mode
• Supplying concise setup documentation and commented code

Inventory management or PayPal wallets are on the roadmap but not part of this milestone. When your hand-off compiles cleanly, processes a test transaction, and includes the required documentation, I will consider the job complete and we can discuss the next phase.