Mobile Wallets and Their Integration with Payment and Card Networks

Tap your phone at a coffee shop, scan a QR code to split a bill, or top up your metro card without touching a rupee note – all of this runs on a small piece of software called a mobile wallet. What looks like a simple app on your screen is actually a tightly coordinated system involving banks, card networks, and payment regulators working together every time you hit “pay.” Understanding how mobile wallets are built and regulated is essential for anyone studying digital commerce, because these wallets have become the default checkout method for millions of Indian consumers.

What is a mobile wallet, exactly? 🔗

A mobile wallet is a digital application that stores payment information – card details, bank account links, or a preloaded balance – and lets a user make payments through a mobile device instead of cash or a physical card. It works as a secure substitute for a physical wallet, holding money in electronic form and completing transactions through mechanisms like QR codes, NFC (Near Field Communication), or in-app transfers. In regulatory language, these wallets fall under a broader category called Prepaid Payment Instruments, which the Reserve Bank of India oversees to keep digital payments safe and accountable.

The building blocks of a mobile wallet 🔗

Every mobile wallet, regardless of the brand, is built from three functional layers. Understanding these helps explain why a wallet can do so much more than just hold a balance.

The payment component 🔗

This is the engine room of the wallet. It handles the actual movement of money – authenticating the transaction, connecting to the user’s bank or card, applying encryption, and settling the payment with the merchant. This component talks directly to banks, card networks, and payment switches like UPI to process the transaction in the background.

The user interface 🔗

This is what the customer actually sees and touches: the balance screen, the “scan and pay” button, the transaction history, and the option to add money or link a card. A well-designed interface hides the technical complexity of the payment component so that paying feels as simple as tapping a button.

The umbrella wallet-issuer layer 🔗

Sitting above both is the company that issues and manages the wallet – think Paytm, PhonePe, Amazon Pay, or a bank’s own app. This layer is responsible for compliance, customer onboarding (including KYC), fraud monitoring, and holding the licence or authorisation required to operate as a Prepaid Payment Instrument issuer. It essentially governs how the payment component and the user interface work together across the wallet ecosystem.

Open, semi-closed and closed wallets: what’s the difference? 🔗

Not all mobile wallets offer the same freedom of use. The Reserve Bank of India’s framework for Prepaid Payment Instruments classifies wallets based on where and how the stored value can be spent. This classification matters because it determines what a wallet issuer is legally allowed to do, and how much regulatory approval they need.

Closed wallets carry the least risk since money never leaves the issuing platform, which is why they are exempt from the direct licensing requirements applied to the other two categories. Semi-closed wallets sit in the middle: they can be used across a network of merchants that have signed on with the issuer, but redemption and cash withdrawal remain restricted unless the wallet meets full KYC requirements. Open wallets offer the most flexibility because they are typically issued by banks and are usable virtually anywhere a card network is accepted, including for cash withdrawal.

Where India’s rules stand today 🔗

The regulatory picture has evolved. Under the RBI’s 2021 Master Directions on Prepaid Payment Instruments, the earlier semi-closed and open categories were reorganised into Small PPIs and Full-KYC PPIs, alongside the retained Closed System PPI category. Full-KYC PPIs, which involve complete identity verification of the holder, now allow a much higher balance, with the limit raised to two lakh rupees along with permission for cash withdrawal from non-bank issuers. Small PPIs, issued with minimal details like an OTP-verified mobile number, are meant for low-value, everyday transactions. For coursework purposes, though, the open, semi-closed, and closed terminology remains the simplest way to understand how wallets differ in scope and risk.

How wallets plug into card networks 🔗

Mobile wallets rarely operate in isolation. Most link back to card networks like Visa, Mastercard, or India’s own RuPay to actually move money between a user’s bank and a merchant’s account. When you link a debit or credit card to a wallet, the wallet does not simply copy your card number. It typically requests a token – a unique, encrypted stand-in for your card details – from the card network, so your actual card number is never exposed to the merchant during the transaction. This process, known as tokenisation, is one of the main reasons wallet payments are considered safer than swiping a physical card at an unfamiliar terminal.

NPCI, RuPay and UPI interoperability 🔗

In India, much of this card-network plumbing runs through the National Payments Corporation of India. RuPay, NPCI’s own domestic card network, functions as an affordable, locally managed alternative to international networks and is deeply integrated with UPI and wallet systems. The RBI has also mandated interoperability for full-KYC wallets, meaning a wallet issued by one company can now be used to pay at merchants accepting a completely different wallet or UPI app. This mandate routes wallet-to-wallet payments through UPI and routes card-based prepaid instruments through interoperable card networks, so users are no longer locked into transacting only within their own wallet’s merchant network. In practice, this means a customer holding a wallet from one provider can scan any UPI QR code, and the transaction is routed and settled correctly behind the scenes, with the non-bank wallet company participating through a sponsor bank that complies with UPI’s settlement norms.

What’s fuelling the mobile wallet boom in India? 🔗

None of this infrastructure would matter without widespread internet and smartphone access. India’s digital payment growth has tracked closely with the expansion of mobile connectivity. India’s internet subscriber base crossed 969 million by March 2025, growing over 1.5 percent within the year, largely on the back of broadband and mobile data expansion. As mobile data has become cheaper and smartphone penetration has deepened, particularly outside major metros, digital wallets have moved from being a convenience for tech-savvy urban users to a default payment method for a much broader population, including small vendors, students, and gig workers.

Why this matters for commerce 🔗

For businesses, the wallet-card network combination has lowered the barrier to accepting digital payments. A small kirana store no longer needs an expensive point-of-sale card machine; a printed QR code linked through UPI and the card network infrastructure is enough. For consumers, this means faster checkouts, instant refunds, and access to credit-like products such as RuPay credit cards linked directly to UPI. For the broader economy, it means a larger share of transactions become traceable and formal, which supports tax compliance and financial inclusion goals. Understanding this ecosystem is not just an academic exercise: it explains why practically every e-commerce, transport, and retail business in India today builds its checkout flow around wallets and card networks rather than around cash.

Mobile wallets, then, are not standalone apps but the visible front end of a layered system involving payment processing, user experience design, regulatory classification, and card network settlement. As India’s internet base keeps growing and RBI continues to refine its PPI framework, this system is likely to become even more interoperable and embedded into everyday commerce.

What do you think? Do you think India’s push for full interoperability between wallets and UPI will eventually make standalone semi-closed wallets less relevant? And as a student of commerce, how do you see the open-semi-closed-closed wallet classification evolving as digital payments keep growing?

References

1. https://www.rbi.org.in/commonperson/english/scripts/FAQs.aspx?Id=2812
2. https://www.lexology.com/library/detail.aspx?g=8830a2f4-c7ef-4fe0-8966-5a59be808d52
3. https://trilegal.com/knowledge_repository/new-master-directions-on-prepaid-payment-instruments/
4. https://www.nipl.com/how-it-works/interoperability/rupay
5. https://www.emarketer.com/content/india-s-central-bank-imposes-interoperability-rule
6. https://razorpay.com/learn/rbi-upi-interoperability-digital-wallets-upi/
7. https://ddnews.gov.in/en/indias-internet-subscribers-cross-969-million-in-fy25-driven-by-broadband-growth-trai/