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I need a developer to add a brand-new payment option to my Shopify checkout that routes transactions through Fygaro Link using a JWT flow. The store already accepts PayPal, Stripe and Shopify Payments, but this new gateway must operate as a fully custom method and coexist seamlessly with the existing ones. Key points • The gateway must generate and sign the JWT on the fly, pass it to Fygaro Link, then handle the callback to update the Shopify order status automatically. • All transactions will run in a single currency, so no multi-currency logic is necessary. • The solution has to live entirely inside Shopify—preferably as a private app or a custom extension—without forcing shoppers to leave the checkout flow. • Clear, reusable code and step-by-step documentation are essential so I can maintain the integration later. • End-to-end testing in both sandbox and live mode must confirm that orders, refunds and failed payments are reflected correctly in the admin panel. Deliverables 1. Source code (Node.js or Ruby preferred, but open to other Shopify-compatible stacks) 2. Setup instructions and environment variables for JWT secret management 3. Written test plan with screenshots or screen recordings of successful and failed payment scenarios 4. A short walkthrough call once everything is live and processing orders If you have previous experience building custom Shopify payment gateways or working with JWT-based flows, your expertise will be a perfect fit for this task. Timeline: 7-10 days
Project ID: 40438062
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88 freelancers are bidding on average $182 USD for this job

⭐️⭐️⭐️ Custom Shopify Payment Gateway Integration (Fygaro Link + JWT Flow) ⭐️⭐️⭐️ Hello, I checked JD and you want — a custom payment integration inside Shopify that adds Fygaro Link as a new payment method using a secure JWT-based flow, fully synced with order lifecycle events (success, failure, refund) without disrupting existing gateways. • Custom Shopify payment gateway integration (Fygaro Link) • JWT generation & secure signing on-the-fly • Payment redirection + callback handling • Automatic order status updates in Shopify admin • Compatibility with existing PayPal, Stripe & Shopify Payments • Refund & failed payment handling sync • Secure environment variable management for secrets • Sandbox + live mode configuration support • Clean Node.js/Ruby-based backend implementation • Webhook handling for payment confirmation • Fully documented setup + deployment guide • Test plan with success/failure/refund scenarios • End-to-end QA testing and validation • Post-deployment walkthrough support Let’s chat… Thanks
$400 USD in 7 days
9.6
9.6

Hello there, I have experience building secure Shopify payment integrations, custom apps, and API-based checkout solutions using Node.js and Shopify’s latest app architecture. Based on your requirements, I can create a robust JWT-based payment flow that dynamically generates and signs tokens, securely redirects transactions through Fygaro Link, and automatically updates Shopify order statuses through callback/webhook handling. I would be glad to help integrate Fygaro Link as a fully custom payment gateway into your Shopify store while ensuring it works seamlessly alongside PayPal, Stripe, and Shopify Payments. The integration will be designed to feel native to your Shopify checkout experience, with clean architecture, reusable code, and proper documentation so future maintenance remains simple. I can implement this either as a private/custom Shopify app or extension depending on the best approach for your store setup and checkout eligibility. You’ll receive: --Complete source code --Deployment and setup documentation --Sandbox and live testing reports --Support during launch --Ongoing maintenance assistance if needed I’d love to discuss your Shopify setup and begin planning the integration right away. Looking forward to working with you! Ghanshyam
$135 USD in 3 days
9.4
9.4

Hello, With over ten years of experience in web development and an extensive skillset including HTML, JavaScript, PHP, and Shopify, I am confident that I am the ideal candidate for this custom gateway project. Having worked on numerous Shopify websites before, including building custom payment gateways, I have gained a deep understanding of Shopify's architecture and can integrate complex functionalities seamlessly. My technical know-how also includes Node.js and Ruby, which are preferred languages for Shopify-compatible stacks like this project requires. I understand the importance of coexistence and smooth integration with the existing systems in your store. Therefore, I'll ensure that the new Fygaro payment option not only works independently but also in harmony with your current gateways such as PayPal, Stripe and Shopify Payments. My strong attention to detail means that I will provide clear documentation and reusable code for the JWT flow so you can maintain the integration easily in the future. Moreover, my rigorous testing approach guarantees that every aspect of the new gateway will run smoothly in both sandbox and live mode, mirroring correct order status, refunds, and failed payments in your admin panel. Let's work together to turn this vision into a reality that will take your business to new heights. Looking forward to discussing this incredible opportunity and being part of your team soon! Thanks!
$130 USD in 3 days
8.6
8.6

Hi, This is a payment integration project where correctness matters more than speed,because we’re dealing with checkout flow, order state sync, and financial event consistency between Shopify and Fygaro. That’s exactly the kind of system I build. Why I’m a good fit for this: • I specialise in API-driven Shopify apps, not just theme-level development This project requires a proper backend layer (Node.js/Ruby app), secure JWT signing, and webhook-driven order updates, not frontend tweaks. • I have experience with secure payment flows and state management • I build “production-safe” integrations, not just proof-of-concepts Deliverables: Node.js (or Ruby if preferred) app source code JWT + environment setup documentation Full test plan with real execution proof Short walkthrough session after deployment Shopify’s checkout architecture has strict rules depending on your plan (standard vs Shopify Plus). I’ll confirm the correct compliant implementation path before development so the solution is stable and not dependent on fragile workarounds. Why this will work: Because the focus is not just “connecting APIs” — it’s ensuring payment state consistency between Fygaro and Shopify without breaking checkout reliability. I can start immediately and begin by reviewing Fygaro’s JWT + callback spec alongside your Shopify setup to finalise the safest integration approach. Best regards RAHEEL
$90 USD in 7 days
8.1
8.1

Hi! I can help you with integrating Fygaro as a custom payment gateway in your Shopify store. The JWT signing and callback handling is straightforward and I'd build it as a Shopify app extension so it sits natively in the checkout alongside your existing Stripe and PayPal options. Ruby is my go-to so that works well here. I'm Edward, 10+ years with Ruby and I've worked with JWT auth flows and payment integrations before. I'll include clean docs and the walkthrough call once it's live. Let me know if you want to discuss the details.
$50 USD in 7 days
7.0
7.0

I can build a custom Shopify private app/extension integrating Fygaro Link with a secure JWT signing flow, ensuring seamless checkout processing, callbacks, and automatic order status updates. I’ll implement clean, reusable Node.js code with full sandbox/live testing and clear documentation for easy long-term maintenance. Best regards Ihtsham
$240 USD in 1 day
7.1
7.1

Hello, I can help you integrate a custom Fygaro payment gateway into your Shopify checkout, ensuring it works seamlessly with your existing PayPal, Stripe, and Shopify Payments methods. I will generate and sign the JWT on the fly, handle all necessary callbacks, and maintain Shopify's user experience throughout the transaction process. Clear and reusable code, along with comprehensive documentation, will be provided to facilitate future maintenance. Thanks, Teo
$200 USD in 2 days
6.8
6.8

Hi there, I see you need a new payment option added to your Shopify checkout that routes transactions. Integrating Fygaro's API with Shopify is a straightforward process, but it requires careful handling of authentication and transaction flows to ensure everything runs smoothly. I would approach this by first reviewing Fygaro's API documentation for any specific requirements, then setting up a custom payment gateway in your Shopify store. This would involve creating a secure connection and ensuring the user experience during checkout is seamless. I'd start by setting up a development environment to test the integration before going live. Q1: What specific features do you expect from the payment option? Q2: Are there any particular compliance or security requirements you want to prioritize? Q3: Do you have a preferred timeline for this integration? Let’s make this happen smoothly.
$200 USD in 2 days
6.6
6.6

Hi, you’ll get a fully working Fygaro Link payment integration inside Shopify with secure JWT flow and automatic order status updates. I understand you need a custom payment method that signs JWT on the fly, sends it to Fygaro, then correctly handles callbacks for success, failure, and refunds—all while staying inside Shopify checkout without disrupting PayPal/Stripe. I’ve saved client hours weekly with n8n automation while building API-driven payment and order workflows. I’ll build this as a Shopify custom app using Node.js, with secure JWT handling, webhook callback processing, and clean order state mapping so everything syncs correctly in Shopify admin. You’ll also get sandbox + live testing coverage and clear setup docs for long-term maintenance. Have you already confirmed Fygaro’s exact callback structure and required JWT payload format? Best Regards, Fizza
$60 USD in 2 days
5.8
5.8

Hi, The Fygaro JWT-signed flow into Shopify checkout is the tricky bit — it needs to live as a custom payment app so shoppers never bounce out, with the JWT generated server-side per transaction and the callback firing back to mark the order paid, refunded or failed in the admin. My plan would be a private Shopify app in Node.js: sign the JWT with the Fygaro secret held in env vars, post to Fygaro Link, then handle the return webhook to hit the Shopify Admin API and update order status. Sandbox first, then live, with screen recordings of paid, refunded and declined cases for the test plan you asked for. Most of my recent work is mobile (React Native and Flutter), but I've built Node backends with JWT auth and REST integrations across those apps, so the signing and callback layer is familiar ground. Happy to share a sample. One question before I commit: do you already have Fygaro sandbox credentials, or do I need to help set those up too? Asif
$250 USD in 3 days
5.4
5.4

⭐⭐⭐⭐⭐ ✅Hi there, hope you are doing well! I have built custom Shopify payment gateways before, smoothly integrating JWT-based flows that handle real-time transaction updates without disrupting the checkout experience. From my experience, the most critical part of this project is ensuring the JWT generation and callback handling are flawlessly integrated within Shopify to keep the payment seamless and order statuses synced. Approach: ⭕ Develop a private Shopify app or custom extension using Node.js to generate and sign JWTs dynamically ⭕ Embed the Fygaro Link gateway within Shopify checkout without redirecting shoppers ⭕ Implement callback functions to update Shopify order statuses automatically ⭕ Create clear, reusable code with comprehensive setup documentation ⭕ Perform thorough testing in sandbox and live environments for payment success and failure handling ❓ Could you share access to your current Shopify setup and Fygaro API documentation? ❓ Are there any specific security protocols or JWT token expiration requirements? I am confident I can deliver a robust, maintainable custom payment gateway integrated fully into your Shopify store for seamless transactions. Thank you for considering my proposal. Best regards, Nam
$200 USD in 3 days
5.5
5.5

You’re essentially building a custom payment rail that has to behave like a native Shopify gateway without breaking the existing checkout experience, so the tricky part is less the JWT itself and more keeping order/payment states perfectly in sync when callbacks fail, users abandon the redirect, or Fygaro responds late. I’d handle this as a Shopify custom payment app in Node.js so the JWT generation, signing, callback validation, and webhook handling stay isolated and maintainable. First step would be mapping Fygaro’s flow against Shopify’s payment lifecycle, then implementing signed token generation with secure env-based secret management and idempotent callbacks so duplicate notifications don’t corrupt order states. After that I’d wire sandbox/live testing around refunds, failed authorizations, and retry cases to make sure the admin reflects reality consistently. I’ve done similar custom Shopify work for HL Fashions where payment and fulfillment flows had to coexist cleanly with existing Shopify apps, so documenting operational edge cases is something I already account for from day one. One thing I’d want to confirm first: does Fygaro provide server-to-server webhooks for payment status changes, or only browser redirects/callbacks?
$140 USD in 7 days
5.4
5.4

Hi, Custom Shopify payment extensions with JWT-based flows are a specific piece of work — I've built integrations in this pattern before and your spec is clear enough that I can scope this accurately. Here's how I'd approach it: a Shopify Functions-based payment extension handling JWT generation and signing on the fly, Fygaro Link handoff, and callback processing to update order status automatically — all without redirecting the shopper out of checkout. Coexistence with your existing PayPal, Stripe, and Shopify Payments setup is straightforward at that layer. Deliverables as scoped: clean Node.js source, environment variable setup for JWT secret management, sandbox and live test coverage for orders, refunds, and failures, and a walkthrough call once it's live. One question before I confirm timeline: does Fygaro Link's callback support webhooks directly to a Shopify endpoint, or does it require an intermediary server to process the response? That affects the architecture slightly and I want to give you an accurate 7–10 day estimate rather than a loose one. — Haroon
$140 USD in 7 days
2.2
2.2

Lets chat, a free consultation and no obligation. I understand you need a clean, professional, and user-friendly solution for your "Custom Shopify Fygaro Gateway" project. My skills in PHP, Java, JavaScript are a perfect fit for this project. While I am new to freelancer.com, my extensive experience delivers integrated, automated solutions. Regards, Jason McLachlan
$188 USD in 3 days
1.4
1.4

Hello, I’d be happy to help with your project. With experience in building custom Shopify payment gateways and working with JWT-based flows, I understand the importance of seamless integrations and clear documentation for future maintenance. I am well-versed in Node.js for Shopify-related tasks and can ensure a fully custom payment option within the Shopify checkout flow. Here’s how I’ll approach your project: ✔ Generate and sign JWT for Fygaro Link integration ✔ Handle callback for automatic order status updates ✔ Implement single-currency transactions ✔ Develop the solution as a Shopify private app or custom extension ✔ Provide clear code and detailed documentation ✔ Conduct end-to-end testing for orders, refunds, and failed payments ✔ Include setup instructions and JWT secret management My goal is to deliver a reliable, polished solution that works smoothly end-to-end and is easy to maintain or extend in the future. Best regards, Manthan
$100 USD in 14 days
0.0
0.0

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