Keywords - HoseaCodes/Mune-UI GitHub Wiki

API/SDK

Well-designed APIs and accompanying SDKs are essential for external partners to integrate with your payment platform. Documenting and exposing payment, wallet, and other capabilities via APIs allows connected apps, websites, and services to build on top of your infrastructure. This unlocks new use cases and adoption channels.

Cloud Infrastructure

A cloud platform from AWS, Google Cloud, or Microsoft Azure provides the always-on server capacity and resilience required for financial transactions. These platforms come with capabilities like auto-scaling that enable resources to expand or contract based on real-time volume requirements.

Digital Wallet

A digital wallet offers customers the ability to securely store payment credentials, such as credit cards or bank accounts, within your platform. This avoids requiring re-entry of details for each transaction, and also allows customers to easily switch between payment methods at checkout.

ID Verification

ID verification solutions like Jumio provide automated screening of government IDs during onboarding. By cross-checking customer IDs against verification databases, you can validate user identities in real-time, reducing fraud while also fulfilling KYC/AML regulations tied to financial services.

CRM System

A customer relationship management (CRM) system is critical for payment platforms that need to track profiles, transaction histories, communications, and other customer data. This is because, as your user base scales, manual workflows break down. CRMs like Salesforce, Zendesk, and HubSpot, however, integrate with your platform to enable in-depth visibility into all customer interactions.

Building on the theme established by the other answers: it's hard because there are many speciality systems that make it happen. But if you identify each of those discrete systems then you can begin to break it down into it's unique parts.

  • Interface
  • Security
  • Authentication
  • Verification
  • Transaction
  • Billing & Invoicing
  • Interbank Exchange
  • Compliance
  • Fraud
  • Fulfillment
  • User / Account Management
  • Marketing / Advertising
  • Partnerships and PR
  • User Research

Paypal developers and other similar programmers should build a product, encapsulating one of the above functions, with an architecture/framework/process that's open enough to work with as many potential partners as possible.