Secure E-commerce Payment Integration

I run an e-commerce site that is ready to launch, but I still need a seamless, fully secure payment solution put in place. Your task is to wire the store to a trusted gateway—whether that ends up being Stripe, PayPal, Square, or another PCI-compliant API that you recommend—so customers can check out without a hitch.

Here is what I expect:
• End-to-end gateway configuration on both the front end and server side
• API keys, webhooks, and callback URLs set up and verified in test and live modes
• Responsive error handling and clear status messaging for the shopper
• Final sandbox and live transactions fully tested, with screenshots or logs as proof
• A brief hand-off guide so I can manage refunds, captures, and future updates on my own

My priority is security and reliability; speed of completion comes next. If you have recent experience integrating payments into e-commerce platforms and can show successful, secure deployments, let’s get this wrapped up.