Mobile App Payment Gateway

@corpmember29

Hello, I have carefully reviewed your requirements and fully understand the project scope. I have 10+ years of experience in full-stack development, including building secure payment systems and mobile SDKs for iOS and Android. I can design and implement a PCI-compliant, tokenized payment gateway with backend APIs, merchant dashboard, and Swift/Kotlin SDKs that integrate seamlessly into your existing app. Deliverables will include RESTful APIs with sandbox and production endpoints, sample checkout screens, 3-D Secure flow, refund and void functionality, webhooks for real-time order updates, deployment scripts, and complete technical documentation. I WILL PROVIDE 2 YEARS FREE ONGOING SUPPORT AND COMPLETE SOURCE CODE, and follow Agile methodology for smooth delivery from development to deployment. I am available according to your time zone and will work until the system meets all acceptance criteria. I eagerly await your positive response. Thanks.

@rahuliitm69

Hi there, I can help build a secure, centralized in-app payment gateway for both iOS and Android, letting users pay with any major card without leaving the app, fully PCI-compliant and tokenized. My approach will be to design and develop the backend API, merchant dashboard, and lightweight Swift and Kotlin SDKs that your dev team can drop straight into your existing apps. The system will handle authorizations, captures, refunds, voids, provide clear error codes, and expose webhooks for real-time order updates. I’ll also provide sandbox and production endpoints, sample checkout screens, deployment scripts for AWS, and concise technical documentation with a Postman collection for testing. For timeline and milestones, I’d suggest sharing your current app setup and hosting environment, so I can provide a realistic estimate. I’d request to connect to discuss any special flows or dashboard features before starting. Thanks, Rahul A.

@TalhaAhmed02

Hi, you need a secure, app-native payment gateway that handles full card processing (tokenization, 3DS, refunds, webhooks) across iOS and Android, without relying on external redirects. At TechForge Innovations, we build secure fintech-grade systems and mobile SDK integrations, backed by 37 reviews, a 4.9 rating, and a 95% job success rate, with strong experience in API architecture, payment flows, and PCI-conscious systems. Full backend payment gateway API (auth, capture, refund, void, webhook system) iOS (Swift) + Android (Kotlin) SDKs with tokenized checkout + 3DS flow support Secure merchant dashboard for transaction monitoring, refunds, and logs Sandbox + production environment setup with Postman collection for testing AWS-ready deployment scripts with encryption, role-based access, and audit logs Approach: Stripe/Adyen-level architecture pattern using tokenization + hosted card fields internally embedded in SDKs, with webhook-driven state management for real-time updates. Timeline: API foundation (3–4 days), SDK integration (4–6 days), dashboard + QA (2–3 days), deployment + final testing (2 days). Next step: share your preferred processor (or if you want us to design the abstraction layer first), and we’ll start with the architecture + sandbox gateway within 48 hours.

@Srashtasoft

Hi there, I have read your project requirement. You need a secure, PCI-compliant centralised payment gateway with backend API, merchant dashboard, and native SDKs (iOS + Android) that support in-app card payments, tokenisation, 3D Secure, and real-time webhooks. We can build a production-ready payment system with a scalable backend, secure tokenisation layer, and lightweight SDKs for seamless in-app checkout. The solution will handle authorisation, capture, refund, and void operations with clear error handling and fast response times, while ensuring full compliance and security best practices. Questions: ========= Do you want to build this gateway fully from scratch or on top of an existing processor (e.g., acquiring bank/processor integration)? Which regions/countries should the gateway support (affects PCI scope and 3DS requirements)? Do you require vaulting for saved cards and recurring payments/subscriptions? Should the merchant dashboard include analytics/reporting in phase 1 or only transaction management? Best Regards, Srashtasoft Team

@OutsourceMan

As a seasoned and highly skilled app development organization, I pledge to deliver the secure, reliable, and dynamic payment gateway that your project requires. Over the past 18 years, my team at CnELIndia has developed extensive expertise in iOS, Android, Mobile App Development, and Payment Gateway Integration – all of which make us an ideal fit for your needs. Additionally, our experience with Swift and Kotlin enable us to build SDKs that perform tasks such as authorization, capture, refunding, and voiding transactions without a hitch. We value clear communication and thus will create technical documentation concise yet comprehensive enough to guide the use of our created system. Our deployment scripts/instructions will ease local hosting on AWS or any standard cloud environment saving your time. And for an optimum client experience, we will transform your work-flow by adding webhooks providing you real-time information for updated order status. We pledge every sensitive data involved in transactions is encrypted both at rest as well as transit for meeting PCI DSS checks. Through these guarantees and our proven track record of completing projects on time while strictly adhering to budget constraints (as advised), I assure you the best possible service inception till the closure of this project.

@kamran2012

Interesting project, I will build your centralized payment gateway with a RESTful API handling authorization, capture, refunds, and voids, plus native SDKs for iOS (Swift) and Android (Kotlin) with in-app card tokenization and 3D Secure. I will also deliver a merchant dashboard, webhook integration, deployment scripts for AWS, and a Postman collection. I will isolate card data at the SDK level using client-side tokenization so raw card numbers never reach your server, which simplifies your PCI scope from SAQ D down to SAQ A-EP significantly. Questions: 1) Are you integrating with an existing processor (Stripe, Adyen), or building a standalone gateway from scratch? 2) Do you need recurring billing or subscription support in the initial release? Happy to answer any questions. Best regards, Kamran

@dinhthi

Hello This is exactly the kind of system we’ve built before—secure payment flows, in-app checkout, tokenization, and mobile SDKs. We can deliver: • Backend API (auth, capture, refund, void, webhooks) • Merchant dashboard (transactions, logs, refunds) • Swift & Kotlin SDKs with sample UI + 3DS flow • Sandbox + production environments • Full docs + Postman collection Tech approach: Backend: Laravel / Node.js DB: PostgreSQL Infra: AWS-ready (Dockerized) Security: tokenization, encrypted data (AES-256), TLS, signed webhooks, audit logs, PCI-compliant architecture (no raw card storage) We focus heavily on performance and reliability—API response <3s, clear error codes, idempotent requests, and stable webhook delivery. We’ve built payment/wallet systems and understand edge cases like retries, failed states, and real-time sync. We can start immediately and deliver in phases (API → SDK → dashboard → testing). Happy to walk you through our approach and share relevant demos. Best regards

@rbtech1984

Hello There!!! ★★★★ (Secure in-app payment gateway for iOS and Android) ★★★★ I understand you need a centralised mobile payment gateway that lets users pay with any major card inside your app without leaving it, while ensuring full PCI compliance and tokenisation. You need backend APIs, merchant dashboard, SDKs for Swift and Kotlin, webhooks, and end-to-end flows for authorise, capture, refund, and void transactions. Services mentioned here based on project details ⚜ Design and build secure backend API with sandbox and production endpoints ⚜ Develop iOS and Android SDKs with sample checkout and 3-D Secure flow ⚜ Enable card tokenisation and encrypted transaction handling ⚜ Implement webhooks for real-time order status updates ⚜ Provide merchant dashboard with transaction logging and reporting ⚜ Deliver deployment scripts for AWS or standard cloud hosting ⚜ Supply complete documentation and Postman collection for testing I have hands-on experience building mobile payment gateways and SDKs with Swift, Kotlin, and secure REST APIs. My approach ensures fast, seamless transactions while keeping data fully encrypted and PCI-compliant. Excited to help you integrate this quickly and securely. Warm Regards, Farhin B.

@divumanocha

Hello, I came across your project and found it truly interesting. With over eight years of hands-on experience in this field, I have successfully delivered high-quality solutions to clients worldwide. My dedication to excellence is reflected in the 180+ positive reviews from satisfied clients. I’d love to bring this expertise to your project and ensure outstanding results. However, I do have a few important points I’d like to clarify to align perfectly with your vision. Let’s connect via chat so I can share relevant examples of my past work. I look forward to hearing from you. Best Regards, Divu.

@Inventcosoftware

With my extensive expertise in mobile app and AI development, I am confident in my ability to produce an exceptional payment gateway solution for your mobile app. Having built over 50 successful mobile applications, I understand the complexities and challenges inherent in delivering both speed and security. My fluency in Flutter and React Native make me the ideal candidate for ensuring smooth, cross-platform compatibility. Innovation is a keystone value of mine, which can be seen through my frequent adoption of novel technologies like OpenAI and Azure OpenAI. This skill set will undoubtedly translate well into creating a seamless integration of your existing code-base with my secure and PCI-compliant payment gateway design. Moreover, I bring to the table end-to-end development capabilities that encompass everything from initial design to final deployment. As such, I am prepared to provide you with not only an excellent payment gateway but also a detailed technical documentation and postman collection to aid future usage. Choose me as your premier architect because together, we can bring your vision to reality, efficiently and effectively!

@malviyamanish

I’m a payment systems expert with 10+ years of experience building secure, PCI-compliant gateways and mobile SDKs. I’ve delivered similar solutions with tokenization, 3D Secure, and real-time webhooks, making me a strong fit for this project. I’ll design a robust backend API, merchant dashboard, and lightweight iOS (Swift) & Android (Kotlin) SDKs with seamless in-app payments—no redirects. The system will support auth, capture, refund, and void flows with strong encryption and compliance. You’ll get fast, reliable delivery, clean documentation, and smooth AWS deployment with clear communication throughout.

@Curveballsol

Hello, I understand that you are looking for a freelancer to develop a secure, centralized payment gateway for your mobile app on both iOS and Android platforms. My expertise in Mobile App Development, Android, iOS Development, Kotlin, and iPhone makes me a suitable candidate for this project. I will design, build, and document the full stack of the gateway, including the backend API, merchant dashboard, and SDKs. The service will handle transactions securely, be PCI-compliant, and provide clear error codes and webhooks for real-time order status updates. I have experience in developing similar solutions and have successfully delivered projects in the past. You can view my portfolio https://www.freelancer.com/u/Curveballsol to see some of my previous work. Best regards, Curveball Solutions

@codefusion53

Hi I understand you need a fully secure, centralized payment gateway integrated directly into your mobile apps, supporting in-app card payments with tokenization, PCI compliance, and real-time transaction handling across iOS and Android. This includes backend APIs, SDKs, and a merchant dashboard. I would design a secure backend using a RESTful API with strong authentication, encryption, and tokenization for card data. The system will support authorize, capture, refund, and void operations, along with webhooks for real-time updates. I will develop lightweight SDKs in Swift and Kotlin with embedded checkout flows, including 3D Secure support. A simple dashboard will allow transaction monitoring, and deployment scripts will ensure smooth setup on AWS or similar environments. Before delivery, I will test full payment flows including success, failure, and refunds, validate response times, confirm webhook accuracy, and ensure all data handling meets PCI compliance standards. Best, Justin

@abhisaini0188

Hello, With over 8 years in full-stack development and a specialization in AI-powered applications, I have the expertise needed to create a solid, high-performance mobile app payment gateway for your iOS and Android platforms. My knowledge of backend systems, especially in Python and Node.js, guarantees that I can design the necessary RESTful API for your gateway while ensuring that it meets PCI-DSS standards. Additionally, my experience with API integration on platforms like OpenAI allows me to make sure every transaction is secure, encrypted at rest and is well-documented. Having successfully built card gateways as well as familiarized myself with payment SDKs before, I assure you of a streamlined process that adheres strictly to security requirements without undermining speed. I understand the importance of real-time updates on order status so, I'll provide feature-rich SDKs (Swift and Kotlin) that your team can confidently integrate into your existing codebase with just one click. In addition to creating scalable solutions akin to what you've requested, my service will include a comprehensive yet concise technical documentation, brief postman collection for easy testing as well as continuing to offer long-term support & collaboration for smooth running and improvements. Let’s get started on building a mobile app payment gateway that securely enhances user experience. With Regards!

@itswahabahmad

Building a secure and efficient payment gateway for your mobile app perfectly aligns with my skillset and experience. Although my core expertise is in game development, I have in-depth knowledge and hands-on experience in Android, iOS, and Mobile App Development, essential skills for this project. In the past, I have successfully developed complex software solutions while adhering to stringent security protocols like PCI DSS. Moreover, my understanding of Unity, Unreal Engine, and Roblox means that I am comfortable working across different frameworks and SDKs. This adaptability is vital for creating the lightweight Swift and Kotlin SDKs you require. My codebase management skills are also an asset as I'm well-versed in integrating new features into existing systems without compromising quality. Above all, I approach every project with a deep sense of responsibility and ownership. I understand the value of smooth payment processing in enhancing user experience which ultimately drives profits for businesses. Optimum performance, scalability, and reliability are my goals for any software solution I create. Let's connect to discuss further how we can leverage my expertise to build a centralized payment gateway solution that exceeds your expectations.

@Riasatali78

I can build a secure, PCI-compliant payment gateway with full backend, merchant dashboard, and plug-and-play iOS (Swift) & Android (Kotlin) SDKs, including tokenization and 3D Secure flow. I’ve worked on payment integrations and will ensure fast, reliable transactions with clean APIs and real-time webhooks. Ready to start and deliver a scalable, production-ready solution quickly.

@mahig47

Hello! As per your project post, you’re looking to build a secure and centralized mobile app payment gateway that integrates directly into iOS and Android apps, allowing users to pay with major credit and debit cards inside the app while maintaining PCI compliant, tokenized, and secure transactions. The goal is to deliver a full stack gateway with backend API, merchant dashboard, and lightweight Swift and Kotlin SDKs. My focus will be on delivering a complete mobile payment gateway solution, featuring: REST or GraphQL API with sandbox and production environments, Swift and Kotlin SDKs with sample checkout screens and 3D Secure flow, secure card tokenization and PCI aligned architecture, merchant dashboard for transaction monitoring and refunds, webhook system for real time order updates, and AWS ready deployment scripts with Postman collection and technical documentation. I specialize in payment gateway architecture, secure API development, mobile SDK creation, and cloud deployable fintech systems with focus on scalability, compliance, and maintainable code. My focus will be on building a reliable and secure gateway that your development team can quickly integrate and scale across multiple environments. Let’s connect to review your preferred acquiring bank, hosting environment, and compliance scope so we can finalize the architecture and implementation plan. Best regards, Nikita Gupta.

@DngPhgNam

⭐⭐⭐⭐⭐ ✅Hi there, hope you are doing well! I have developed secure payment gateways with mobile SDKs before, enabling seamless in-app card payments while ensuring PCI compliance and smooth user experience. The most important part is ensuring end-to-end security with strict PCI DSS compliance and reliable real-time transaction handling. Approach: ⭕ Design and implement a robust RESTful API with sandbox and production environments ⭕ Develop lightweight Swift and Kotlin SDKs including 3-D Secure and tokenization ⭕ Build a merchant dashboard for transaction management and real-time updates via webhooks ⭕ Provide deployment automation scripts and comprehensive technical documentation ❓Could you clarify if you prefer REST or GraphQL API? ❓Is there an existing backend environment to integrate with, or will this be fully new? ❓Are there any specific cloud provider requirements besides AWS compatibility? I am confident I can deliver a secure, performant, and well-documented payment gateway that meets all your acceptance criteria. Looking forward to working with you. Best regards, Nam

@mughiraaa

Hi, I can help you build a secure, centralized payment gateway that integrates smoothly into your mobile app for both iOS and Android. The gateway will handle credit and debit card payments directly in the app, with PCI-compliant tokenisation for maximum security. I'll deliver the API, iOS, and Android SDKs, ensuring quick and seamless transactions, while keeping everything within the app. You’ll also get clear error handling, real-time webhooks, and comprehensive documentation for easy integration. Let me know if you'd like to dive deeper into the specifics! Best, Mughiraa