I need a straightforward public Shopify app that drops a WhatsApp chat button onto any store, much like the WA Chat Button already in the marketplace. The core requirement is simple: once the merchant installs the app and enters their WhatsApp number, a floating button appears on every storefront page and opens a WhatsApp conversation in a new tab or the WhatsApp desktop/mobile app. Key points I care about • One-click installation with Shopify OAuth. • Merchant dashboard where they can enter or edit the phone number and toggle the widget on/off. • Position options: merchants must be able to choose whether the button floats bottom-left, bottom-right, or bottom-center. (I’m not looking for full colour/icon/size controls right now; positioning is the only appearance setting required.) • Clean, lightweight frontend script that doesn’t slow the store—vanilla JS preferred, no heavy frameworks on the storefront. • App must pass Shopify review; please handle everything through to successful publishing under my partner account, including the necessary listing assets, privacy policy link, and webhooks for uninstalls. Example: https://apps.shopify.com/wa-chat-button Tech expectations Liquid, Shopify Admin API, App Bridge, and React (for the embedded admin) are fine—whatever delivers the simplest maintainable codebase. Source code should be organised and documented so I can hand it to another dev later if needed. Deliverables 1. Fully functional, reviewed, and published public app. 2. Partner dashboard transfer or collaborator access so I can see installs and metrics. 3. Zipped source code and a brief README for local setup, plus a short Loom or similar walkthrough. Let me know your rough timeline to MVP, any prior Shopify apps you have launched, and what ongoing maintenance or SLA you can offer after it’s live.