My dropshipping store is already live on Shopify, and I need a specialist who can plug in PayPal as an external payment gateway without disrupting a single checkout. I will hand over the full API credentials and supporting docs; your task is to wire everything up through Shopify’s API layer—webhooks, callbacks, and any private-app logic required—so customers can pay smoothly on every device. Here’s what matters most to me: • A clean, PCI-compliant flow that keeps buyers on track from cart to confirmation • Solid error handling and clear logging so issues surface before any order is lost • Thorough end-to-end testing in sandbox and live modes, followed by a quick round of fixes if anything crops up If you have a track record of custom gateway builds on Shopify—especially with PayPal—send over a link or two, outline the high-level steps you’ll follow, and tell me how long each phase will take. Once the integration is signed off, I’d like a brief handover showing where to view logs, refresh tokens, or update keys in the future. I’m ready to start as soon as you are and I’m happy to answer any technical questions right away.