Payment apps and portals people trust and use
We help banks, processors and fintechs design and build the mobile apps, web portals and API platforms that cardholders, merchants and partners rely on every day, with security and payments expertise built in from the start.
What our clients are up against
Security that cannot slow people down
Payment apps must resist tampering and fraud while keeping card controls, wallet provisioning and payments fast and simple.
Many channels, one platform
Cardholder apps, merchant portals, partner APIs and admin tools often grow separately, making new features slow to deliver everywhere.
Releases under close scrutiny
Every release must pass internal security reviews, accessibility expectations and app store review without delaying the roadmap.
How we cover Mobile & Web Platforms
Cardholder and merchant apps
Design mobile and web experiences built around real payment journeys.
- Cardholder banking and card management apps
- Merchant apps for sales, settlements and disputes
- Wallet apps with card provisioning and contactless payments
- Software development kits (SDKs) for partners and embedded payments
- Payment experience design for onboarding, checkout and card controls
- Accessibility aligned with the Web Content Accessibility Guidelines (WCAG)
Portals and API platforms
Give merchants, partners and internal teams one consistent way in.
- Merchant and administration portal design
- API platform architecture, versioning and access management
- Developer portals with documentation, sandboxes and onboarding
- Back-office tools for operations, support and risk teams
Secure mobile architecture
Protect credentials, sessions and transactions on devices you don't control.
- App attestation to confirm genuine apps on genuine devices
- Secure storage using hardware-backed keystores and secure enclaves
- Runtime application self-protection (RASP) and tamper detection
- Strong authentication with biometrics and device binding
- Secure communication, certificate pinning and API protection
Release and app store readiness
Ship confidently and keep releases predictable.
- Release pipelines, staged rollouts and feature flags
- Apple App Store and Google Play review readiness
- Security testing and penetration test remediation planning
- Monitoring, crash reporting and post-release support processes
Ways to work with us
Architecture review
An independent assessment of your apps, portals and APIs with a prioritized plan for security, consistency and delivery speed.
Platform design & delivery
Senior architects and engineers who design your digital platform and work alongside your teams and vendors through launch.
Team training
Hands-on programs that give your mobile, web and API teams the payments and security background they need.
Build your team's capability
These modules can be delivered as a standalone program or tailored to your platform.
Request informationModules (some proposed)
- Secure Mobile Architecture for Payment Apps
- App Attestation, Secure Storage and RASP in Practice
- Building Wallet and Card Management Features
- API Platform and Developer Portal Design for Payments
- Payment Experience Design and Accessibility
- Release Engineering and App Store Readiness for Financial Apps
Services, case studies and tools
Can you build the app, or only advise on it?
Both. We can act as your independent architect, setting the design and reviewing the work of your teams or vendors, or we can design and deliver the platform alongside your engineers. Either way, we focus on the payments and security layers, where our experience runs deepest.
How do you keep a payment app secure on devices you don't control?
We layer several protections. App attestation confirms the app and device are genuine, hardware-backed storage keeps keys and credentials out of reach, and runtime self-protection detects tampering or debugging. On the server side, every request is authenticated and checked against risk signals. No single control is enough, so we design them to work together.
Can you add wallet provisioning and card controls to our existing app?
Yes. We design the integration between your app, your issuer systems and the wallet and token services, including push provisioning to Apple Pay and Google Pay, card freeze and limits, and real-time notifications. We plan the work so it fits your current release cycle.
Do you design merchant and developer portals as well as mobile apps?
Yes. Merchant portals, admin tools and developer portals share many of the same building blocks as mobile apps: identity, permissions, APIs and audit trails. We design them as one platform so features reach every channel consistently and your partners can onboard on their own.
Let's build apps your cardholders trust
Talk to a senior consultant about your mobile and web roadmap.