Shopify Payment Plugin Integration

@websolution98

Hello, I’m **Jahangir Alam**, with **3+ years of experience** in Shopify development and API integrations. I can build a **production-ready Shopify payment app** that connects your REST endpoints (Create Order, Status, Refund, Refund Status) with Shopify’s checkout flow, supporting both **UPI and card payments**. I’ll implement **real-time status handling (polling/webhooks)**, seamless checkout experience, and **fully automated refund logic from the Shopify admin**, ensuring accurate syncing back to your system. The code will be **clean, well-documented**, and easy for your team to manage, with full testing on a dev store (payments + refunds). I have a quick question regarding your preferred flow (redirect vs embedded UI), which will help finalize the architecture. Please message me in chat — I’d love to discuss!

@amaank66

You already have the hardest layer done—your payment APIs. What you need now is a Shopify-native bridge that feels seamless, reliable, and compliant. That’s exactly where I specialize. I’ve built custom payment integrations that handle order creation, async status handling, and refund sync—so wiring your UPI + card flows into Shopify’s Payments framework will be clean and production-ready. How I’ll implement this: • Shopify payment app (custom/public) using Payments/Hosted SDK • Create Order → trigger on gateway selection • Secure redirect/embedded flow for UPI + card • Async handling: polling + webhook-ready logic for Check Status • Auto-update Shopify order state (success/failure) Refund automation: • Hook into Shopify refund action • Call Refund API → track via Refund Status • Sync final state back to Shopify (full/partial supported) Quality & compliance: • Secure API key/env handling • Clean, well-documented codebase • PCI-aware flow (no sensitive data stored) • Full dev-store testing (payment + refund scenarios) Timeline: 5–8 days (build + testing + handover) You’ll get a gateway that works exactly like native Shopify payments—but powered by your system. Best regards, Amaan Khan L. (CUBEMOONS PVT.)

@Syedh1998

Hi, I can develop a production-ready payment integration for Shopify that connects your existing REST APIs (Create Order, Check Status, Refund, Refund Status) into a fully functional custom payment gateway. The solution will be built as a Shopify payment app using Shopify’s Payments/Hosted SDK approach. When a customer selects your gateway at checkout, the plugin will trigger your Create Order API, handle redirection or embedded payment UI for UPI and card flows, and continuously verify payment status via your Check Status endpoint until completion or failure. For refunds, I’ll implement Shopify admin-triggered refund handling so that when a merchant initiates a refund, the plugin automatically calls your Refund API, monitors progress via Refund Status, and updates Shopify accordingly. This ensures seamless synchronization between your backend and Shopify’s order system. The integration will include secure API handling, environment-based configuration, proper error handling, and webhook/polling mechanisms where needed. I’ll also provide clean, well-documented source code along with setup instructions so your in-house team can manage and extend the solution easily. Finally, I’ll test the full flow on a development store, covering successful UPI and card payments as well as partial and full refunds, ensuring everything works reliably before deployment. Ready to begin immediately. Syed

@webexpertvicky13

Interesting project — integrating custom UPI + card REST APIs into a Shopify payment gateway with refund sync is something I can implement cleanly. I can build a Shopify payment app that connects your Create Order, Check Status, Refund, and Refund Status endpoints directly into Shopify checkout and admin. What I’ll implement: • Custom Shopify payment gateway (app-based) • Call Create Order on payment selection • Redirect / embedded UPI & card payment flow • Poll Check Status until success/failure • Update Shopify order payment status automatically • Handle failed/cancelled payment states Refund Integration: • Shopify admin “Refund” trigger support • Call Refund API automatically • Poll Refund Status endpoint • Sync refund result back to Shopify • Support full and partial refunds Technical: • Shopify Payments API / Hosted payment flow • Webhook handling for order updates • Secure API key + environment config • Proper error handling and retries • Production-ready structure Deliverables: • Working Shopify payment app • UPI + Card payment support • Refund automation from admin • Clean commented source code • Setup & env documentation • Dev store testing (charge + refund) I have experience building custom payment gateways and API-driven checkout flows. Ready to start immediately.

@msaadarshadkhan

Hi there, I am ready to start Shopify Payment Plugin Integration. I have 4+ years of experience in PHP and JavaScript, so I already have a clear idea of how to approach this efficiently. just close your eyes and trust me, you will be happy. You can check my past .NET and PHP projects here: https://www.freelancer.com/u/msaadarshadkhan Lets Start?

@Mayanks010

Hi there, You’re absolutely in the RIGHT PLACE. I’ve delivered SIMILAR PROJECTS multiple times and know EXACTLY how to execute this efficiently and correctly from day one. To lock down the SCOPE, TIMELINE, AND PRICING, I’ll need to ask you a few key questions. Unfortunately, Freelancer’s 1500 CHARACTER LIMIT doesn’t allow me to break everything down properly here. Let’s jump on CHAT so I can show you my PROVEN PAST WORK, walk you through the REAL RESULTS I’ve delivered, and outline a CLEAR ACTION PLAN for your project. You’ll immediately see why my approach is DIFFERENT and EFFECTIVE. If you’re serious about getting this done RIGHT, I’m ready to move forward. Looking forward to CONNECTING and WINNING TOGETHER. Cheers, Mayank.

@shahrukhh5

As a seasoned web developer and Shopify expert, I have the precise skills and ability to create a robust and production-ready payment plugin that perfectly aligns with your needs on this project. I've had ample experience integrating various APIs like your REST endpoints into Shopify; from creating orders, checking status, managing refunds, and tracking their statuses. I am confident in providing a smooth user experience for both your customers and merchants on the platform. Moreover, thanks to my comprehensive knowledge of Shopify’s Payments/Hosted SDKs, webhooks, and PCI/UPI compliance best practices, I can assure you of a secure and highly compliant solution tailored to your specific requirements. My vast experience in PHP and Node.js backend development also means that the codebase will be clean, well-commented and equipped with instructions for hassle-free integration by your in-house developers. Lastly, I understand the importance of testing to ensure optimal functionality. Thus, I will run thorough end-to-end tests on a development store making successful charges and full or partial refunds through UPI as well as card options to assure quality before final delivery. Let me put my expertise to work for you ensuring timely deployment without compromising on excellence in results!

@mariamz24

Hi, We would like to grab this opportunity and will work till you get 100% satisfied with our work. We are an expert team which have many years of experience on PHP, JavaScript, .NET, C# Programming, HTML, Shopify, Web Development, Payment Gateway Integration, Shopify Development, API Integration Lets connect in chat so that We discuss further. Regards

@techmadigital

I can build this custom Shopify app. I can publish this on Shopify App store as well. Unfortunately your budget is low. I can do this perfectly. Please let me know which gateway you are using ?

@hasany65

Hello, I am an experienced web developer with 8 years of professional experience, specifically within the Shopify ecosystem. I can build a production-ready Shopify payment app (public or custom) that integrates your REST endpoints Create Order, Check Status, Refund, and Refund Status directly into Shopify’s Payments API. I will ensure the app correctly handles both UPI and card flows, implementing continuous polling or webhook listeners for status confirmation. I'll also build the refund logic to trigger your endpoints automatically from the Shopify admin. You will receive well-documented source code and clear installation instructions for your team. I have previously worked on complex Shopify integrations and e-commerce platforms, focusing on secure and efficient payment processing. I'm ready to set up a development store and perform end-to-end testing to prove a successful charge and refund flow. Best regards, Hassan

@ankitdasrock

As a seasoned programmer and automation specialist, I am highly adept at executing projects similar to yours. Within my diverse skillset lies a combination of expertise in Kotlin, Python, JavaScript-the perfect trio for executing your Shopify payment integration project. Over the years, I have delivered robust applications, built backend APIs, and executed web scraping operations with finesse. Thus, guaranteeing the development of a reliable and efficient Shopify plugin, no less. My work ethic aligns with delivering top-notch code that is sustainable and easy to maintain - qualities that you mentioned are important for you. My proficiency in data handling and reporting further assures you clean code with proper documentation and well-commented source codes that will make it easy for your in-house developers to maintain the plugin. I have spent a considerable portion of my career creating automated tools to streamline workflows; this aligns with your goal of making merchants' lives easier by enabling them to trigger refunds from their admin panel. Drawing from my past projects on AI task automation tools and scripts for complex operations, I assure you, this won't be an uphill task! When you hire me, expect nothing but the best: efficient solutions that improve productivity and drive optimal results.

@Abishek754

Hi there, Building a production-ready Shopify payment app that flawlessly handles both card and UPI rails requires strict adherence to Shopify's Payments Apps architecture. I have the exact backend expertise in JavaScript and PHP to wire your four REST endpoints directly into Shopify's checkout and admin ecosystem securely. Having developed complex backend architectures and API integrations for platforms handling transactional data—such as the Rupnidhi billing software and the e-bhojan platform—I know how to manage secure payment states and synchronize asynchronous data perfectly. My Execution Plan: Seamless Checkout Flow: I will build the custom app to trigger your Create Order endpoint, securely redirect to your UI for UPI/Cards, and implement robust polling/webhooks for the Check Status endpoint to confirm the transaction. Automated Refund Logic: I will wire Shopify’s native admin refund action to your Refund API, tracking the Refund Status to automatically push the final outcome back to the merchant's dashboard. E2E Testing: I will set up a Shopify development store to rigorously test full/partial refunds, alongside successful and failed charges. Clean Handover: You will receive exceptionally clean, commented code with documentation for managing .env variables and API keys. I am ready to review your API documentation. Let's connect! Best regards, Abishek

@calebr13

Hello My Best client. Integrating custom payment rails into Shopify requires precise API orchestration, and I ensure every transaction from UPI to refund flows seamlessly without disrupting checkout. Your project requires expertise in Shopify Payments API, Hosted SDKs, webhook management, and PCI/UPI compliance to handle both card and UPI flows with automated refund logic. In previous, I have experience in a project similar to your requirement. In the project, the challenge point was creating a custom payment app that synchronized external refund statuses back to Shopify admin while handling asynchronous UPI confirmations without timing out. I used Node.js, Shopify API, and Redis to solve challenges. For payments, I implemented hosted SDK redirection and For refunds, I used webhook listeners with automatic status pushes. In the process of solving the above, I have gotten rich experience so I think I am an ideal candidate for your project. Regarding I am a full-time developer, I work full-time in your time zone and can start working today. I am very interested in your project, have excellent communication skills, and will always strive to provide a more perfect result. I would like to discuss your project in more detail with you. You can call me at any time if necessary. I'm looking forward to a message from you. Cheers

@ArtemYanger12

full-stack architect with experience in creating ERP from scratch: PHP 8, custom MVC framework, REST API, RBAC, frontend in ES6+ (Webpack, managers, Action System). Independently designed integrations, documentation, testing. Deep understanding of backend, security, asynchronous scenarios. Ideal for implementing a Shopify payment plugin - quickly understands the Shopify API, writes clean code, and provides reliable payment and refund logic.