
Open
Posted
•
Ends in 5 days
Paid on delivery
I need a clean, reliable way to stop real transaction identifiers from ever reaching the customer side of my checkout flow. The top priority is PayPal: every PayPal Transaction ID must be swapped for an internal token before it appears in a browser response, confirmation email, or third-party script. Because I also process some payments through Stripe, I want the same protection there, but only for transaction details—specifically the Stripe Transaction ID. Merchant and customer data can stay exactly as is. The workflow I picture is straightforward: 1. Payment request is made. 2. Your middleware (language is your choice) intercepts the gateway response. 3. The live Transaction ID is replaced with a hashed or otherwise obfuscated value. 4. The real ID is written to my database so I can reconcile, refund, or dispute without friction. 5. All other functionality—webhooks, payouts, dispute handling—continues to work untouched inside PayPal and Stripe. Deliverables • Production-ready, well-commented source code that plugs into both PayPal’s REST API and Stripe’s API/webhooks to perform the cloaking. • Lightweight schema or config file mapping hashed IDs to the originals. • Step-by-step deployment guide for a standard Linux stack. • Test plan proving a sandbox payment shows only the masked ID client-side while the true ID remains visible in each gateway’s dashboard. Acceptance Criteria: a live sandbox purchase on both gateways completes successfully; browser network logs, customer emails, and webhook payloads expose only the masked ID; I can retrieve the true ID on demand from the stored mapping. Let me know how you would structure the middleware layer and your estimated turnaround time.
Project ID: 40628810
206 proposals
Open for bidding
Remote project
Active 2 hours ago
Set your budget and timeframe
Get paid for your work
Outline your proposal
It's free to sign up and bid on jobs
206 freelancers are bidding on average £142 GBP for this job

Hi there, We understand you need a secure middleware solution to cloak real transaction identifiers from reaching the customer side of your checkout flow, prioritizing PayPal and also supporting Stripe for transaction details. Our team at Webbook Studio has experience with payment gateway integrations, including PayPal and Stripe, and we can develop a reliable middleware layer using PHP or JavaScript to intercept and replace live Transaction IDs with hashed values. We've worked on similar projects, such as a custom payment system for an e-commerce website, where we integrated multiple payment gateways and ensured secure transaction handling. One question: do you have any specific preferences for the hashing algorithm or storage solution for the ID mapping? Feel free to message us to discuss the details! — Webbook Studio
£160 GBP in 3 days
9.2
9.2

Hello, As a seasoned senior developer with my A4Logic team, I have years of experience in crafting bespoke software solutions to solve complex client needs, precisely similar to what you're seeking. Understanding the importance of robustly securing transaction details, I have also worked extensively with payment gateways like PayPal and Stripe, which makes me an excellent fit for your project. My expertise includes JavaScript and PHP, incorporating API integrations, payment gateways solutions alongside software development. An additional reason why you should choose my team is our clear-cut methodology and strong attention to detail. This eliminates the possibility of overlooking any critical aspect of your project. Furthermore, our proven ability to meet project timelines while delivering quality work will ensure a smooth, prompt delivery and deployment for your Linux stack. Lastly, our success lies in providing long-term support even after project completion. A skill that will prove crucial as we maintain a robust mapping system in your database so you can retrieve true IDs without any friction. In conclusion, if you are looking for a trusted professional that guarantees 100% satisfaction while adhering to strict deadlines, then look no further. Choose me and let's create a secure and reliable e-commerce environment for you. Thanks!
£30 GBP in 1 day
8.6
8.6

Hi, I reviewed the request to stop real gateway Transaction IDs from reaching the customer side, with priority on PayPal and also masking Stripe Transaction ID details while keeping merchant/customer data unchanged. I’ll implement middleware that intercepts PayPal REST API responses and Stripe API/webhooks, then replace every visible Transaction ID with an internal token using JavaScript, Payment Gateway Integration, and API Development patterns. I’ll store the real ID securely in your database via a lightweight mapping so reconciliation, refund, and dispute flows keep working untouched. I’ll deliver clean, production-ready, well-commented code plus a Linux deployment guide and a test plan to prove sandbox network logs and confirmation emails show only masked values. Let’s discuss here now.
£250 GBP in 30 days
8.4
8.4

Hi, I can build a secure middleware layer for **PayPal and Stripe** that keeps real transaction IDs server-side while exposing only internal masked tokens to customers and browser responses. I’ll intercept the relevant gateway responses, securely map masked IDs to the original transaction IDs in your database, and ensure refunds, disputes, webhooks, and reconciliation continue working normally. I’ll also verify that the real IDs are never unintentionally exposed through client-side responses, emails, or third-party scripts. I’ll provide clean, documented source code, the mapping schema, deployment instructions, and sandbox tests for both PayPal and Stripe. Best regards, **Muhammad Rizwan LA**
£80 GBP in 1 day
8.2
8.2

I understand you need to cloak gateway transaction IDs to prevent sensitive data from being exposed or scraped from your payment flow. I have extensive experience working with PayPal API integrations and handling backend data processing, so I can implement a secure mapping system to mask these IDs effectively while maintaining transaction integrity. My core stack includes PHP, JavaScript, and a deep understanding of software architecture, which allows me to build custom solutions rather than relying on plugins. I have spent 15 years troubleshooting and securing web platforms, so I am well-equipped to handle the security and logic required for this specific gateway implementation without disrupting your existing checkout process. I can complete this work for £120.88 within 1 day. Let me know if you have the API documentation ready, and we can get started on the implementation immediately.
£120.88 GBP in 1 day
8.1
8.1

I’ll build a server-side middleware layer that cloaks PayPal Transaction IDs and Stripe Transaction IDs while preserving reconciliation, refunds, disputes, payouts, and gateway dashboard visibility. I’ll use PHP/Laravel with a secure mapping table: each gateway ID will be associated with a non-reversible HMAC-based internal token, while the original value is encrypted at rest and accessible only to authorized backend operations. The integration will intercept PayPal REST responses and Stripe API results before they reach browser code, customer emails, analytics, or third-party scripts. PayPal and Stripe webhooks will terminate on the server, be signature-verified, and have their raw gateway data kept private; sanitized internal events containing only masked IDs will be passed to the rest of the application. This is necessary because gateway-signed webhook payloads cannot be altered at the provider, but they can be prevented from being exposed downstream. I’ll include idempotent mapping logic, lookup support for refunds and disputes, configuration/schema files, logging without leaking identifiers, and PHPUnit/integration tests using both sandboxes. The deployment guide will cover Linux environment variables, database migration, webhook configuration, permissions, and verification through browser network logs, emails, and webhook consumers. Muhammad Saad
£100 GBP in 3 days
7.9
7.9

He!!----------have you already built the checkout flow, or should the middleware also handle the complete PayPal and Stripe payment integration? I would implement a middleware layer between your application and the payment gateways that intercepts API responses and webhooks, securely stores the original transaction IDs, generates unique hashed tokens for client-facing responses, and preserves all refund, reconciliation, and dispute workflows without exposing the real transaction IDs. Estimated turnaround: 3–5 business days. Thanks!! Parminder
£299 GBP in 5 days
8.2
8.2

Keeping raw PayPal and Stripe Transaction IDs off the customer side while preserving your ability to reconcile is a clean tokenization problem, and it's exactly the kind of middleware I build. I'll write a Node/Express (or PHP, your call) layer that sits between your app and each gateway: it intercepts the API/webhook response, generates a stable internal token — a random opaque ID mapped in your DB, which is safer than a plain hash of the real value — and substitutes that token everywhere client-facing (browser responses, confirmation emails, third-party scripts), while the true ID is stored server-side for refunds, disputes, and payouts. Webhooks and reconciliation keep working because I translate tokens back to real IDs internally, never exposing them. You'll get commented source, the mapping schema, a Linux deployment guide, and a sandbox test plan proving only the masked ID appears client-side. I can start right away.
£20 GBP in 1 day
7.6
7.6

Hi there, I will implement middleware that intercepts gateway responses so real PayPal and Stripe transaction identifiers never appear client-side, while preserving dashboard visibility and webhook correctness. I will create language-appropriate cloaking handlers, a minimal mapping store keyed by an internal token, and integration points that keep merchant and customer payloads unchanged. For PayPal and Stripe, the masked ID will be returned in browser responses and confirmation emails, while the real IDs remain stored for reconcile and refund flows. To proceed, I need one clarification about how you currently host and expose the checkout endpoints. Best regards, Umer Hayat
£555 GBP in 1 day
6.9
6.9

Hi there! I'm Markiyan, a full stack developer and CEO of a web agency, and I'd love to help you implement a reliable transaction ID cloaking system for PayPal and Stripe. I understand you need a middleware solution that intercepts gateway responses, replaces live Transaction IDs with hashed values, and stores the real IDs in your database for reconciliation and other purposes. My team and I have experience with payment gateway integrations, including PayPal and Stripe, having completed projects like a learning platform website with custom PHP development and a British online store with Shopify and ERP integration. I can deliver a production-ready, well-commented source code that integrates with both PayPal's REST API and Stripe's API/webhooks, along with a lightweight schema for mapping hashed IDs to originals. One question: do you have a preferred programming language for the middleware, or would you like me to suggest the most suitable option based on your existing tech stack? Feel free to message me to discuss the details! — Markiyan
£170 GBP in 3 days
6.9
6.9

Hi, It sounds like you need to ensure PayPal and Stripe transaction IDs don’t leak into browser traces or emails while keeping them accessible for refunds or disputes. The middleware should intercept gateway responses, replace real IDs with tokens, store the mapping, and leave the rest of the payload unchanged. I’ve built similar gateway integrations before, handling payment flows and webhook processing for a system that processed hundreds of transactions daily. That project required masking sensitive details while preserving backend logic, much like what you’re describing. A lightweight Node or PHP service between your checkout and payment gateways would work well. It would watch for PayPal REST and Stripe responses, swap transaction IDs for hashed values, store the originals in a simple table, and forward the rest of the payloads unchanged. Using a fast reversible format like AES-256-GCM with rotating keys would keep obfuscation lightweight while allowing lookups. The main risk is missing an event—PayPal’s webhooks or Stripe’s async events could cause mapping drift. A small background job reconciling gateway dashboards with stored mappings would catch gaps without overcomplicating things. I can get a sandbox version live in a few days and refine it once we validate the flow under real traffic. Thanks, Denis
£20 GBP in 3 days
6.4
6.4

Hello! We can build a middleware solution to mask payment transaction IDs across your checkout flow. 1. Should the masking apply only to transaction IDs, or to all payment-related fields? 2. Do you already have the middleware layer and database mapping in place? — About us We are dZENcode – a full-cycle IT company for digital product development: from design and programming to integrations and post-release support. We build projects from scratch and also work on existing solutions that need further development, improvements, or technical support. You can find detailed information about our services and rates on our official website: https://dzencode.com. Please review it – after that, we can discuss the details and agree on the next step. ⚠️ After clarifying all details, we will define the scope, the suitable cooperation format – task-based, outsourcing, or outstaffing – and the final cost. Projects are guaranteed to reach release with us: • 10+ years providing IT services; • 90+ in-house specialists; • 250+ public reviews since 2015; • We support products under SLA after launch; • We work under NDA and a company contract!
£135 GBP in 7 days
6.7
6.7

I’d structure this as a server-side middleware layer that stores the real PayPal and Stripe transaction IDs in an encrypted mapping table, then returns only an internal token to the browser, emails, logs, and downstream integrations. Gateway webhooks would still be received with the original ID on the secure backend, then sanitized before being forwarded or displayed so refunds, disputes, and reconciliation continue working normally. Deliverables will include PayPal and Stripe sandbox tests, database schema, deployment guide, and documented source code. Estimated turnaround: 4–6 days. Ready to start once I review your current checkout stack.
£150 GBP in 4 days
6.4
6.4

Hello Dear, I’m Md Toriqul Islam, and I’m excited to partner with you. I can dive into your project immediately. With over 10 years of experience building secure payment integrations, backend APIs, and middleware solutions. I understand you need a middleware layer that masks PayPal and Stripe transaction IDs while securely storing the original identifiers for reconciliation, refunds, disputes, and maintaining full webhook compatibility without affecting existing payment workflows. I have rich experience in PHP, Node.js, Python, PayPal REST API, Stripe API, webhooks, encryption, and secure backend architecture. I’m ready to start immediately and would be happy to discuss your requirements and implementation approach. Looking forward to hearing from you. Best regards, Md Toriqul Islam
£65 GBP in 2 days
6.3
6.3

Hello, I’ve gone through your project details and this is something I can definitely help you with. I have 10+ years of experience in mobile and web app development, working with Flutter, Android, iOS, React, Node.js, and APIs. I focus on clean architecture, scalable code, and clear communication to ensure the project runs smoothly from start to finish. I will first review your requirements, suggest the best technical approach, and then proceed with development while keeping you updated at every stage. Here is my portfolio: https://www.freelancer.in/u/ixorawebmob I’m interested in your project and would love to understand more details to ensure the best approach. Could you clarify: How do you envision the middleware layer processing the transaction identifiers? 1. Do you need this for mobile, web, or both? 2. Do you already have UI/UX designs or should we create them? 3. Will there be any third-party API or payment gateway integration? 4. What is your expected timeline for completion? 5. Are there any reference apps or websites you like? Let’s discuss over chat! Regards, Arpit Jaiswal
£250 GBP in 25 days
7.2
7.2

Hi There! I specialize in payment gateway integrations and secure API development with 9+ years of experience building middleware for PayPal, Stripe, and other payment platforms. Here's how I can help: 1. Build a middleware layer that securely maps gateway transaction IDs to internal tokens. 2. Preserve webhook, refund, dispute, and reconciliation workflows without exposing real IDs client-side. 3. Deliver documented code, deployment steps, and sandbox testing for both PayPal and Stripe. Which backend stack are you currently using (PHP, Node.js, Python, etc.), and do you already have PayPal and Stripe sandbox environments configured?
£135 GBP in 7 days
6.1
6.1

I appreciate the clarity of your project requirements regarding Gateway Transaction ID Cloaking. Safeguarding sensitive transaction identifiers is crucial, especially in today's digital landscape. Your outlined workflow presents a structured approach, and I'm eager to develop a reliable middleware solution that seamlessly integrates with both PayPal and Stripe. In crafting this solution, I envision utilizing robust encryption methods for ID obfuscation, ensuring complete security while maintaining transparency for reconciliation purposes. The focus will be on performance and ensuring that all existing functionalities, like webhooks and payouts, remain unaffected. I will provide production-ready, well-commented source code, along with a concise deployment guide tailored for a standard Linux environment. The test plan will validate that clients see only the masked IDs, and you'll have easy access to the original IDs whenever needed. I'd love to explore more about the specific technologies you're considering for this middleware layer. This insight will help me tailor my approach to your needs. Let me know what you think! Best, Talha
£20 GBP in 14 days
6.0
6.0

Hello, I’m a Full Stack Developer with experience in payment gateway integrations, including PayPal and Stripe. I can build a secure middleware layer that masks transaction IDs while preserving full payment, webhook, refund, and dispute functionality. I will deliver clean, well-documented code, secure ID mapping, deployment guidance, and complete sandbox testing to ensure only masked transaction IDs are exposed on the client side. Available to start immediately. Thanks, Santosh
£120 GBP in 3 days
6.9
6.9

Hello, Leveraging my strong background in computer science and my extensive experience with both front-end and back-end development, I am confident in my ability to build you a clean, reliable solution to your transaction ID cloaking needs. I have a profound understanding of various programming languages including JavaScript and PHP, ensuring that the chosen middleware language will not be an issue. My expertise extends across building custom web applications & dashboards, developing RESTful APIs & integrations, and designing databases, all of which are crucial for successfully completing this task. My approach to this project would involve creating a robust middleware layer that will work seamlessly with both PayPal's REST API and Stripe's API/webhooks. This layer would effectively intercept the gateway response from either provider and replace the actual transaction IDs with hashed or obfuscated values before they appear in browser responses, confirmation emails, or third-party scripts. Additionally, I would write a lightweight schema or config file that maps these masked IDs to their original counterparts for easy retrieval as per your requirement. I pride myself on delivering high-speed, user-friendly solutions that are 100% complete. I attest to providing step-by-step deployment guides along with thorough testing and smooth handoff/support. Given my familiarity with the necessary tech stack including React(Native), Vue.js, Ang Thanks!
£150 GBP in 6 days
5.9
5.9

As an experienced Full-stack developer who encompasses much more than just coding, I understand the importance of building secure and scalable applications. I have extensive experience integrating payment gateways like PayPal and Stripe, which aligns perfectly with your project requirements. My knowledge in languages and frameworks such as Node.js, PHP (Laravel, CI), Python, and APIs integration (PayPal and Stripe included) will be pivotal in creating a robust and efficient solution for your needs. To tackle your specific need for the gateway transaction ID cloaking, I propose implementing a middleware layer that intercepts the response from both APIs at the correct juncture, replacing the real transaction IDs with hashed or obfuscated values. I will craft a clean and well-commented source code to meet your long-term maintenance needs. Additionally, I will provide you with a lightweight schema or config file mapping those masked IDs to their originals for easy retrieval when needed. With my vast experience in eCommerce projects involving payment gateways, I guarantee sandbox purchases on both gateways will successfully complete while safeguarding sensitive transaction identifiers at every step.
£100 GBP in 2 days
6.1
6.1

United Kingdom
Payment method verified
Member since Jul 24, 2026
£20-250 GBP
£20-250 GBP
£20-250 GBP
₹75000-150000 INR
₹250000-500000 INR
$30-250 USD
€250-750 EUR
₹1500-12500 INR
₹12500-37500 INR
₹1500-12500 INR
$30-250 USD
$10-100 USD
$250-750 USD
₹750-1250 INR / hour
$115-200 HKD / hour
₹1500-12500 INR
₹37500-75000 INR
₹400-750 INR / hour
₹100-400 INR / hour
$250-750 USD
₹1500-12500 INR
$30-250 USD
₹1500-12500 INR