# Shopify Plus & Checkout Extensibility — Expert Shopify Engineers | Shopify Developer Pro > Enterprise B2B, Custom Checkout UI Extensions & Functions API. Hire certified Shopify developers for shopify plus & checkout extensibility. Direct consultation: +91-9119943505. --- Shopify Plus & Checkout Extensibility — Expert Shopify Engineers | Shopify Developer Pro - ⚡ Need expert Shopify architecture, theme development, or speed audit? [Chat on WhatsApp: +91-9119943505](https://wa.me/919119943505?text=Hello%20Shopify%20Developer%20Pro,%20I%20need%20expert%20development%20for%20my%20store.) [Home](/) / [Services](/#services) / Shopify Plus & Checkout ⚡ Official Engineering Discipline • Shopify Plus & Checkout # Shopify Plus Architecture & Checkout Extensibility Development Replace deprecated checkout.liquid with cutting-edge Checkout Extensibility, custom UI extensions, Shopify Functions for dynamic discount logic, and dedicated B2B wholesale portals for enterprise merchants. [ 🚀 Get Technical Consultation (WhatsApp) ](https://wa.me/919119943505?text=Hello%20Shopify%20Developer%20Pro,%20I%20need%20expert%20development%20for%20my%20store.) [ 📞 Direct Call: +91-9119943505 ](tel:+919119943505) Engineering Scope ## Enterprise Deliverables & Capabilities We specialize in high-stakes Shopify architecture where precision, speed, and conversion engineering dictate commercial success. Here is what is built directly into our Shopify Plus & Checkout Extensibility pipeline: ✔ Complete checkout.liquid to Checkout Extensibility Migration - ✔ Custom Checkout UI Extensions (Bespoke Fields, ID Verification, Notes) - ✔ Shopify Functions for Custom Volume Discounts & Tiered Pricing - ✔ Custom Payment & Delivery Customization Rules - ✔ Enterprise B2B Wholesale Portals with Custom Price Lists & Net Payment Terms - ✔ Multi-Store Expansion Architecture & Automated Catalog Syncing ### Project Parameters & SLA Starting Investment (INR) ₹85,000 International (USD) $2,500 Turnaround SLA 10 to 20 Business Days Target Performance Sub-100ms Server Execution #### Core Deliverables: - ★ Production-ready private checkout extension app - ★ Tested Shopify Function discount & payment rules - ★ Comprehensive B2B merchant admin documentation [ 🚀 Book Technical Scope Consultation ](https://wa.me/919119943505?text=Hello%20Shopify%20Developer%20Pro,%20I%20need%20expert%20development%20for%20my%20store.) Got Questions? ## Frequently Asked Questions ### What is Checkout Extensibility and why is checkout.liquid deprecated on Shopify Plus? Checkout Extensibility is Shopify's secure, upgrade-safe checkout architecture replacing checkout.liquid. It allows merchants to customize checkout using React-based UI extensions and WebAssembly-powered Shopify Functions. Shopify officially deprecated checkout.liquid to guarantee security, 1-click Shop Pay speed, and zero breaking changes during platform upgrades. With Checkout Extensibility, developers build private apps using Checkout UI Extensions to add custom gift messages, age verification, delivery instructions, and dynamic loyalty redemption rules. ### What are Shopify Functions and how do they replace Shopify Scripts? Shopify Functions allow developers to customize core Shopify backend business logic — such as custom discount tiers, shipping rules, and payment methods — running as ultra-fast WebAssembly binaries on Shopify's global edge infrastructure. Unlike legacy Ruby-based Shopify Scripts which only ran on checkout.liquid, Shopify Functions execute in under 5 milliseconds on Shopify's edge servers. They support complex B2B tiered pricing, VIP customer discounts, payment method hiding based on cart contents, and custom shipping rate calculations. ### Deep Dive: What is Checkout Extensibility and why is checkout.liquid deprecated on Shopify Plus? (Part 2) Checkout Extensibility is Shopify's secure, upgrade-safe checkout architecture replacing checkout.liquid. It allows merchants to customize checkout using React-based UI extensions and WebAssembly-powered Shopify Functions. Shopify officially deprecated checkout.liquid to guarantee security, 1-click Shop Pay speed, and zero breaking changes during platform upgrades. With Checkout Extensibility, developers build private apps using Checkout UI Extensions to add custom gift messages, age verification, delivery instructions, and dynamic loyalty redemption rules. ### Deep Dive: What are Shopify Functions and how do they replace Shopify Scripts? (Part 2) Shopify Functions allow developers to customize core Shopify backend business logic — such as custom discount tiers, shipping rules, and payment methods — running as ultra-fast WebAssembly binaries on Shopify's global edge infrastructure. Unlike legacy Ruby-based Shopify Scripts which only ran on checkout.liquid, Shopify Functions execute in under 5 milliseconds on Shopify's edge servers. They support complex B2B tiered pricing, VIP customer discounts, payment method hiding based on cart contents, and custom shipping rate calculations. ### Related Engineering Hubs & Cities [Shopify Plus & Checkout in Surat](/hire/shopify-plus-checkout-extensibility-in-surat)[Shopify Plus & Checkout in Jaipur](/hire/shopify-plus-checkout-extensibility-in-jaipur)[Shopify Plus & Checkout in Mumbai](/hire/shopify-plus-checkout-extensibility-in-mumbai)[Shopify Plus & Checkout in Delhi](/hire/shopify-plus-checkout-extensibility-in-delhi)[Shopify Plus & Checkout in Gurgaon (Gurugram)](/hire/shopify-plus-checkout-extensibility-in-gurgaon)[Shopify Plus & Checkout in Bengaluru (Bangalore)](/hire/shopify-plus-checkout-extensibility-in-bengaluru)[Shopify Plus & Checkout in Ahmedabad](/hire/shopify-plus-checkout-extensibility-in-ahmedabad)[Shopify Plus & Checkout in Pune](/hire/shopify-plus-checkout-extensibility-in-pune)[Shopify Plus & Checkout in Hyderabad](/hire/shopify-plus-checkout-extensibility-in-hyderabad)[Shopify Plus & Checkout in Noida](/hire/shopify-plus-checkout-extensibility-in-noida)[Shopify Plus & Checkout in Chennai](/hire/shopify-plus-checkout-extensibility-in-chennai)[Shopify Plus & Checkout in Kolkata](/hire/shopify-plus-checkout-extensibility-in-kolkata) [ 📞 Call: 091199 43505 ](tel:+919119943505) [ 💬 WhatsApp Us ](https://wa.me/919119943505?text=Hello%20Shopify%20Developer%20Pro,%20I%20need%20expert%20development%20for%20my%20store.) --- ## Contact & Immediate Consultation - **Agency**: Shopify Developer Pro - **Direct Call & WhatsApp**: +91-9119943505 (091199 43505) - **Official Domain**: https://shopifydeveloperpro.com - **Documentation**: https://shopifydeveloperpro.com/llms-full.txt