I will integrate secure payment API, payment gateway, and wallet system

M
martinz_felix
M
martinz_felix
Martinz Felix
integrate secure payment API, payment gateway, and wallet system
Full Screen
integrate secure payment API, payment gateway, and wallet system
Full Screen
Full Screen
integrate secure payment API, payment gateway, and wallet systemintegrate secure payment API, payment gateway, and wallet systemintegrate secure payment API, payment gateway, and wallet system

About this gig

Hello and Welcome Did you know Accepting payments online shouldn't be complicated. I'll handle the heavy lifting integrating a secure payment API, gateway, and wallet system into your platform so you can start transacting with confidence, fast.

From one-time checkouts to multi-vendor marketplaces and subscription-based SaaS, I build payment infrastructure that just works.


What I deliver:

  • Custom RESTful API integration with your chosen gateway
  • Digital wallet system deposits, withdrawals, transfers, balance history
  • Recurring billing and subscription payment flows
  • Webhook setup for real-time transaction status updates
  • Sandbox testing before live deployment
  • Tokenization and encryption for secure data handling
  • Transaction logging, error handling & verification logic


Key Features:

  • Secure & PCI-aware
  • Multi-gateway integration
  • Wallet & balance management
  • Subscriptions & recurring payments
  • Documented API endpoints
  • Full sandbox testing
  • Post-launch bug support

Important:

  • You need your own merchant account with the chosen gateways
  • I provide technical integration only
  • I do not process payments on your behalf

Before ordering:

Message me your tech stack, preferred gateway and payment needs

  • Expertise

    • Algorithms & Data structures
    • Localization
    • Performance
    • Security
    • Source control

  • Frontend framework

    • Angular
    • Flutter
    • Next.js
    • React.js
    • Vue.js

  • Backend framework

    • Laravel
    • Flask
    • Node.js
    • Supabase
    • Firebase

Get to know Martinz Felix

Martinz Felix

Full Stack Developer

  • FromUnited Kingdom
  • Member sinceAug 2026
  • Avg. response time3 hours

  • Languages

    English
I’m a professional Full Stack Developer specializing in building modern, responsive, scalable, and secure web applications, APIs, dashboards, SaaS platforms, fintech solutions, and custom software using React, Next.js, Node.js, NestJS, Python, FastAPI, MongoDB, Firebase, and third-party API integrations, with a strong focus on clean code, reliable functionality, great user experience, and delivering solutions that meet each client’s unique business needs.

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