Commercial App: Card Payment Integration

@leadconcept

Greetings, I understand you are looking to integrate a secure, PCI-DSS compliant credit card payment module into your mobile app, supporting Visa, MasterCard, Amex, and similar, with tokenisation, authorisation, and refund handling via Stripe, Braintree, or another trusted SDK. Before we proceed, I would like to clarify a few points. 1, Do you prefer Flutter, React Native, or native builds for Android and iOS for this integration. 2, Should the module include automated error handling and logging for failed transactions. 3, Will future wallet or inventory features need immediate architectural consideration. Our team includes mobile developers experienced in payment integrations, sandbox and live environment setup, clean code delivery, and thorough documentation. We ensure friction free checkout flows, secure handling of card data, and maintainable code ready for future extensions. Let us connect to align on SDK choice, testing, and delivery milestones. The current bid amount is a placeholder to start the conversation. Regards Yasir LEADconcept PS: Let me know, if you want to see our team past work to determine our skills/expertise or past customer's references.

@AwaisChaudhry

Hello, I understand you’re building a revenue-driven app and need a PCI-DSS compliant in‑app card checkout that supports Visa, MasterCard, Amex, and the usual networks, with frictionless authorisation, tokenisation, and refunds. I will wire the checkout into your existing UI, configure a sandbox with test cards, and expose clear live vs sandbox keys, plus concise setup docs and commented code. I can implement this with Stripe, Braintree, or a similar SDK, prioritising a fast, stable release across Flutter, React Native, or native—whichever fits your current codebase. The hand-off will include a tested integration, documented steps, and a clean path to go live smoothly. Which payment gateway and platform should I lock in for this milestone (Stripe vs Braintree, and Flutter, RN, or native) to align with your stack and go-live plan? Which platform should I target for this milestone (Flutter, React Native, or native) based on your current codebase? Do you have a preferred gateway (Stripe vs Braintree) or should I choose based on ease of PCI compliance, costs, and refund workflows? Are there any specific refund scenarios (partial refunds, refunds after reversals) I should plan for? How would you like environment config handled (env vars only, separate config files, CI/CD integration)? What is your target go-live date and any PCI scope constraints I should meet? Best regards,

@ambar

I can handle the card payment integration and hand it back in a working, testable state. **Approach** * Use **Stripe SDK** for card payments (Visa, MasterCard, Amex). * In-app checkout wired into your existing product/cart screens. * No card data touches your servers (Stripe handles tokenisation). * Refund support included via the same integration. **What I’ll implement** * Checkout flow connected to your current UI (no UI redesign). * Stripe sandbox setup with test cards. * Clear environment switch: * test keys * live keys * Minimal backend touchpoints (only what’s required for payment intent + confirmation). * Commented code around payment boundaries only (no noise). **Deliverables** * App build that processes a successful test charge. * One failed/declined test case verified. * Refund flow tested in sandbox. * Short setup note: * where keys live * how to switch test → live * how to verify a transaction **Notes** * Inventory and PayPal intentionally untouched. * Structure kept simple so Phase-2 additions won’t require rework. * I’ll choose Flutter / React Native / native based purely on what your current app already uses. One decision I’ll leave open until you confirm: **Stripe Checkout (hosted) or native in-app card form using Stripe Elements?**

@OutsourceMan

As you seek the selfsame growth that CnELIndia prides ourselves on delivering, I propose our expertise as your confident choice for this diverse project. Our extensive experience includes handling complex mobile application development, making secure payment gateways our bread and butter. We're skilled with a variety of tools including Stripe, Braintree, and SDKs, so we've got the right tool kit no matter your preference. Our understanding of PCI-DSS guidelines guarantees you top-notch safety for all transactions. Choose CnELIndia and we'll provide not only clean code but clear documentation that will serve as a guidepost to any future maintenance or expansion work you may desire. Our emphasis on thorough testing ensures a stable release and our commendable history of meeting delivery timelines perfectly aligns with your need for speedy execution. Your satisfaction is our fuel and indeed it is our international clienteles' trust that has kept this motor running for 18 years strong. Furthermore, our adeptness extends beyond just payment integration. So when you're ready to explore inventory management or PayPal wallets - elements on your roadmap - we'll remain right here. Consider this iOS and Android compatible package from CnELIndia to beget your revenue-focused app with rich technological DNA in Flutter or React Native, all depending on what best services your needs. Let's get started today!

@tangramua

Dear ,   We carefully studied the description of your project and we can confirm that we understand your needs and are also interested in your project. Our team has the necessary resources to start your project as soon as possible and complete it in a very short time.   We are 25 years in this business and our technical specialists have strong experience in PHP, Mobile App Development, iPhone, Android, iOS Development, Payment Gateway Integration, React Native, Flutter and other technologies relevant to your project.   Please, review our profile https://www.freelancer.com/u/tangramua where you can find detailed information about our company, our portfolio, and the client's recent reviews.   Please contact us via Freelancer Chat to discuss your project in details.   Best regards, Sales department Tangram Canada Inc.     

@shubhamshrimal7

Hello, Greetings Hope you are doing well. I am a Mobile Application developer with over 5 years of experience. I am confident in my ability and skills to develop high-quality Mobile apps and would like to work on your commercial app project. I will complete the work as per your requirements. I want to discuss more this project to prepare the final concept. So let’s discuss this in detail over chat then will make plans to start work on it. Waiting for your earliest reply. Thanks. Shubham

@neerajdhameliya

Hello, Portfolio ==> https://www.freelancer.com/u/neerajdhameliya With your requirement for a secure in-app payment module, I can design and develop a production-ready integration that supports major credit cards (Visa, MasterCard, Amex) with frictionless authorisation, tokenisation, and refund handling. The solution will be built with clean architecture, maintainable code, and fully integrated with your existing product and cart screens. The implementation will also include a sandbox environment for testing, clear configuration keys for switching to live mode, concise setup documentation, and well-commented code for easy maintenance. The final result will be a fully functional, secure, and reliable payment system embedded in your mobile app, ready to process live transactions smoothly while adhering to PCI-DSS standards. Please feel free to message me to discuss your product vision and next development phase. Best regards, Niral D

@diektech

Hi, this is Elias from Miami. I checked your description and I understand the goal is to plug a secure in-app card checkout into your existing product + cart screens, with proper tokenization, refunds, sandbox testing, and a clean switch from test to live mode. The key here is doing it in a PCI-safe way (using the gateway’s mobile SDK + tokenization so you never handle raw card data). I can integrate Stripe or Braintree (or your preferred equivalent) and wire the full flow end-to-end: checkout UI hooked into your current screens create payment intent / confirm payment store customer/payment method tokens (if needed later) refunds + error handling sandbox test cards + clear env keys for live mode short setup doc + commented code + basic tests Suggested path: Flutter or React Native with the gateway’s official SDK, plus a small backend endpoint for intents/keys (clean and secure). Q1: Do you need “saved cards” in this milestone, or just one-time payments (with tokens stored only for refunds/records)? Q2: Do you already have a backend to create PaymentIntents/ClientTokens, or should I add a minimal secure endpoint for that? Q3: What’s your product type—one-time purchases only, or do you also need subscriptions later (so we choose Stripe vs Braintree accordingly)? If you share the repo and current cart data structure, I can start wiring checkout right away. Regards,

@Julian29

Hello, I can deliver a clean, production-ready card payment integration focused on speed, security, and a smooth checkout experience. The aim is to connect your existing product and cart screens to a PCI-DSS compliant flow that supports Visa, MasterCard, Amex, and standard refund handling without adding friction for users. For the fastest and most reliable release, I recommend Stripe’s mobile SDKs, using client-side tokenisation and minimal backend exposure, though Braintree is equally viable if you prefer that stack. The implementation will be clear, well structured, and easy to maintain, with environment-based configuration so sandbox and live keys can be switched safely. All delivered code will be commented and accompanied by concise setup notes so your team can extend it later without guesswork. Workflow: • Review current UI and checkout logic • Integrate secure card entry and payment flow • Configure sandbox mode and test cards • Expose clear flags for live mode switching • Validate refunds, errors, and edge cases • Deliver documentation and clean hand-off I have worked on commercial mobile apps where reliable card payments, predictable builds, and clear documentation were critical to launch timelines. Once the project compiles cleanly, processes a test transaction, and meets the agreed scope, we can immediately discuss the next phase of development. Thanks Julian

@DeveloperStation

Hi, We’ve developed several mobile apps with integrated payment systems, including a recent project where we implemented Stripe and PayPal for a multi-vendor marketplace. We also built a custom payment solution for another app, allowing vendors to add their own payment gateways. For your project, I recommend using Stripe, as it’s developer-friendly and offers extensive features. We can also explore other options like Braintree or RazorPay if they better suit your needs. In addition to payment integration, I can help with other essential areas like UI/UX improvements, backend development, and server management, ensuring you get a well-rounded solution. Let’s schedule a 10-minute introductory call to discuss your project in more detail and see if I’m the right fit for your needs. I’m eager to learn more about your exciting project. Best regards, Adil

@sagarjain4010

Hello I’m a mobile app developer with solid experience integrating secure in-app payment systems for revenue-driven apps. I’ve worked with Stripe, Braintree, and similar PCI-compliant SDKs, and I focus on building checkout flows that are fast, secure, and easy to maintain. Based on your setup, I can: -Integrate credit card payments (Visa, MasterCard, Amex, etc.) directly into your existing UI -Handle tokenization, authorization, refunds, and proper PCI-DSS compliance -Set up sandbox and live environments with clean configuration switching -Ensure smooth error handling and clear user feedback during checkout I’m comfortable working in Flutter, React Native, or native iOS/Android, and I’ll choose the stack that lets us ship the most stable solution quickly while keeping your future roadmap in mind. What I’ll deliver: -Fully wired checkout flow inside your current screens -Tested sandbox setup with sample transactions -Clean, commented code with clear config keys -Short setup documentation so your team can manage live mode easily ✔A couple of quick questions before starting: -Do you already have a preferred provider (Stripe/Braintree), or should I recommend one? -Will refunds be handled in-app or via the provider dashboard for now? -Do you need support with App Store / Play Store payment compliance checks? I’m happy to move straight into the next phase. Looking forward to working together. Thanks Sagar

@mrresearcher99

Hi, I can help you integrate a secure, PCI-compliant in-app payment flow and get this milestone shipped cleanly. I have 5+ years of experience working with Android, iOS, Flutter, React Native, and PHP, and I’ve implemented card payments using Stripe and Braintree across mobile platforms. For speed, stability, and compliance, I’d recommend Stripe SDKs, but I’m comfortable using whichever provider fits your preference. My approach would be: Integrate the payment SDK into your existing checkout UI (no redesign needed Implement secure card entry, tokenisation, authorisation, and refunds Configure sandbox/test mode with test cards and clear separation from live keys Expose environment-based configuration for easy switching to production Ensure PCI-DSS best practices by avoiding direct card data handling Test the full flow end-to-end on both platforms You’ll receive: A working in-app checkout processing test transactions successfully Clean, well-commented code aligned with your current app structure Simple setup documentation covering keys, environments, and deployment Guidance for moving to live mode when you’re ready I focus on shipping stable, well-tested integrations and keeping hand-offs clear so future phases (inventory, wallets, subscriptions) can be added smoothly. Best, Bhargav

@giaphung2k1

Hello I will expertly integrate secure, robust card payment processing into your revenue-driven mobile application. My solution ensures seamless transactions, PCI compliance, and an intuitive user experience to maximize conversions and revenue. Let's discuss tailoring the ideal payment gateway to your commercial app's specific needs. Giáp Văn Hưng

@Herculesz

Hi I can integrate a secure in-app credit card checkout into your mobile app using a PCI-DSS–compliant SDK such as Stripe or Braintree. The main technical risk is handling card data safely while keeping the checkout fast and avoiding edge cases like failed authorizations or duplicate charges. I solve this by using native SDK tokenization, client–server separation, and idempotent payment intents so sensitive data never touches your app backend. I’ll wire the checkout cleanly into your existing product and cart UI, ensuring a smooth authorization and refund flow across iOS and Android. Sandbox configuration will be set up with clear environment switches so moving from test to live mode is safe and controlled. My background includes Flutter, React Native, and native mobile payments with robust error handling and logging for easy debugging. You’ll receive commented code and concise documentation so your team can maintain and extend the payment module confidently. Thanks, Hercules

@mahig47

Hello! As per your project post, you are looking to integrate a secure card payment module into an existing revenue driven mobile application. The goal is to enable smooth in app credit card payments for Visa MasterCard Amex and similar providers while fully meeting PCI DSS requirements and ensuring a friction free checkout experience. My focus will be on wiring a reliable payment flow directly into your existing product and cart screens, using a proven gateway such as Stripe or Braintree based on what best fits your timeline and compliance needs. This includes sandbox setup for testing, secure tokenization, refund handling, and a clear separation between test and live configurations so the transition to production is straightforward and safe. I specialize in implementing payment systems in mobile applications with strong attention to security, stability, and developer clarity. My focus will be on clean integration, well commented code, predictable error handling, and concise documentation so your team can maintain and extend the payment module confidently after delivery. Let’s connect to align on payment scope, provider choice, and release priorities so we can ship a secure and production ready checkout experience. Best regards, Nikita Gupta.

@technologiesit

With gratitude for your time and consideration, I, Vimal Kumar, come with over a decade of experience as a freelance developer, primarily specializing in web and mobile applications. Working with a proven track record, my team and I have built and maintained successful websites and apps using various technologies including, pertinent to this project, Flutter, React Native and the like. Additionally, we've always prioritized flexibility - complying readily with our clients' preferences on technologies to create secure, intuitive and efficient solutions. Lastly, it is worthmentioning that I can make your vision tangible within stipulated timeline through offering clear setup documentation alongside well-commented code. Once the hand-off is complete -compiling cleanly and processing test transactions smoothly – you can be at ease whilewe discuss expanding your app's functionality in the next phase should you so desire. So let's join hands to build something great from scratch or even work together on future milestones of this impressive project.

@rbtech1984

Hi There! ⚜⭐⭐⭐⭐⚜(( Integrate a secure in app card payment checkout for Visa, MasterCard, Amex and more. Ensure PCI DSS compliant tokenization, authorization, and refund handling. Deliver clean sandbox setup and easy live mode switch. ))⚜⭐⭐⭐⭐⚜ I have implemented card payment modules in multiple apps with Stripe and Braintree, and I can share similar work in the chat. Your app already has the product and cart screens ready, so I will connect the checkout flow seamlessly and keep the user experience friction free. I will configure the sandbox environment for test cards, expose clear configuration keys for live mode, and deliver well commented code with concise setup documentation. Key features: * Secure PCI compliant card checkout * Tokenization, authorization, and refunds * Sandbox to live mode configuration If you want, we can discuss the best payment gateway option for your app and how to integrate it cleanly into your existing screens. Warm Regards, Farhin B.

@Mahihassi

Having developed apps for both the Android and iOS platforms, I am confident that I possess the skills necessary to seamlessly integrate the card payment feature into your app. My past experiences in developing apps that require secure electronic payment modules have given me a profound understanding of the intricacies of payment gateway integrations. Furthermore, as an app developer, I constantly remain updated on the latest tools and SDKs, thus familiarising myself with Stripe, Braintree, as well as the pertinent PCI-DSS guidelines. What sets me apart from other developers is my capacity to tailor solutions based on specific needs and preferences. Whether you decide to build your app using Flutter or React Native or opt for a fully native Android and iOS experience, you can trust that I will complete it using the most efficient solution and within the stipulated timelines. Additionally, my expertise lies in Python which not only suffices well for your current project but also lays a strong foundation for future milestones like inventory management or PayPal wallets that are on your roadmap.

@DigitaSyndicate

⚠️You are not looking for a coder. You are looking for someone who can build this properly. That is exactly why your project stood out.⚠️ Your focus on embedding a secure electronic payment module that complies with PCI-DSS and supports major credit cards exemplifies a commitment to trusted, seamless transactions—exactly the stability we deliver at DigitaSyndicate. At DigitaSyndicate, a UK-based digital systems agency, we build precision-engineered automation, modern web platforms, and AI-driven systems designed for performance and long-term scalability. Our approach ensures streamlined, secure checkout flows integrated smoothly within your chosen mobile framework whether Flutter, React Native, or native, delivering reliable tokenization and refund handling without compromising on speed or stability. We recently implemented a multi-gateway payment solution for a high-traffic app, fully documented and sandbox-tested. Can you share your main priorities and timeline so I can map out the right execution plan for you? Casper M. Project Lead | DigitaSyndicate Precision-Built Digital Systems.