Case Study: How a Mid-Sized Indian Business Saved ₹1 Lakh/Month in Gateway Fees

When scaling a business in India, founders obsess over Customer Acquisition Cost (CAC), Return on Ad Spend (ROAS), and supply chain logistics. However, one of the largest margin leaks is often hidden in plain sight: Payment Processing Fees.

This case study examines how a mid-sized Indian Direct-to-Consumer (D2C) electronics accessories brand analyzed their payment stack, identified significant inefficiencies, and reduced their monthly payment costs by over ₹1 Lakh — simply by routing eligible UPI transactions through a more cost-effective infrastructure.

Understanding How Payment Gateway Fees Work in India

Before diving into the case study, it helps to understand exactly how Indian merchants get charged for accepting digital payments.

When a merchant signs up with a Payment Aggregator (PA) — such as Razorpay, PayU, or Cashfree — they agree to a fee schedule that typically works as follows:

• UPI (P2M via UPI apps): 0% to 2% depending on the aggregator’s pricing tier
• RuPay Debit Cards: 0% (Zero MDR mandated by government)
• Visa/Mastercard Debit Cards: 0.4% to 0.9%
• Credit Cards: 1.5% to 2.5%
• Net Banking: ₹5 to ₹15 flat per transaction or 1% to 1.5%
• Wallets: 1% to 2%

All of the above are subject to 18% GST on top of the gateway fee, which significantly increases the effective rate. A merchant paying 2% MDR on credit cards is actually paying 2% × 1.18 = 2.36% effective rate.

What Zero-MDR Actually Means

Zero MDR (Zero Merchant Discount Rate) is a government mandate, not a blanket policy covering all UPI transactions. Under the current RBI and NPCI framework, Zero MDR applies to:

1. RuPay Debit Cards — all transactions
2. UPI P2M (Person-to-Merchant) transactions funded from a savings/current bank account or prepaid instrument issued by a bank — subject to NPCI’s operating guidelines

Importantly, Zero MDR does not automatically apply to:

• Credit card-backed UPI (e.g., RuPay Credit Card on UPI) — these carry interchange fees
• UPI transactions processed via a Payment Aggregator’s nodal account — the PA may still charge a platform/technology fee on top of the underlying zero-MDR instrument

This distinction is critical. A customer paying you via GPay from their savings account technically involves a zero-MDR instrument — but if your PA charges you a 2% “platform fee” on that transaction, you are still paying 2% to the aggregator for their software, settlement infrastructure, and nodal account operations. Zero MDR means the bank/NPCI takes nothing; it does not prevent your PA from charging you for their service layer.

The Real Cost of a 2% Fee at Scale

Let’s walk through the math that most growing merchants overlook.

Suppose your business processes ₹50 Lakhs per month in total GMV. Your payment method split is:

• 80% UPI: ₹40,00,000
• 12% Credit/Debit Cards: ₹6,00,000
• 8% Net Banking & Wallets: ₹4,00,000

With a typical aggregator charging 2% + 18% GST (effective 2.36%) uniformly across all payment methods:

Payment Method	Volume	Rate (incl. GST)	Monthly Fee
UPI	₹40,00,000	2.36%	₹94,400
Cards	₹6,00,000	2.36%	₹14,160
Net Banking / Wallets	₹4,00,000	2.36%	₹9,440
Total	₹50,00,000		₹1,18,000/month

At ₹50L/month GMV, a 2% aggregator fee means ₹1 Lakh+ per month in gateway costs — ₹14.2 Lakhs per year — flowing directly from your operating margin to the aggregator.

Now scale that to ₹1 Crore/month GMV and the number doubles to ₹2.36 Lakhs/month, or roughly ₹28 Lakhs per year.

Comparing Gateway Fee Structures Across Aggregators

Not all payment aggregators charge the same rate, and many offer tiered pricing based on monthly volume. Here is a representative comparison of how fee structures differ:

Flat-Rate Aggregators (most common for new/mid-sized merchants)

• Charge the same percentage regardless of payment method
• Simpler to understand, but you pay the same 2% on zero-MDR UPI instruments as you do on credit cards
• Settlement is typically T+1 or T+2

Interchange-Plus or Tiered Aggregators (available at higher volumes)

• Pass through the actual interchange/MDR cost per payment method plus a fixed platform margin
• UPI from debit accounts may be charged at 0% interchange + platform fee (e.g., ₹1–₹3 flat per transaction)
• Better for merchants with high UPI volume, as you stop overpaying on cheap instruments

Direct-to-Bank UPI Routing (for eligible merchants)

• Merchant connects their bank-issued QR or VPA directly to their bank account
• UPI settlements land directly in the merchant’s account with no nodal account intermediary
• The cost is whatever software/SaaS fee you pay for the routing infrastructure (e.g., a flat monthly subscription)
• This approach bypasses aggregator platform fees on UPI, but the merchant must use a separate solution for card and net banking acceptance

Choosing the right structure depends on your volume, payment mix, and technical capability to integrate multiple systems.

The Business Profile: A Growing D2C Brand

The Company: “AuraTech Accessories” (name changed for confidentiality), a popular online store selling premium mobile cases, chargers, and audio gear. Monthly Gross Merchandise Value (GMV): ₹65,00,000 (₹65 Lakhs) Average Order Value (AOV): ₹1,500 Payment Stack: A single, well-known traditional Payment Aggregator handling 100% of checkouts. Payment Method Distribution:

• 85% UPI (GPay, PhonePe, Paytm — all funded from savings/current accounts)
• 10% Credit/Debit Cards
• 5% NetBanking & Wallets

Identifying the Margin Leak

The founders of AuraTech were reviewing their monthly P&L statement and noticed a large line item for “Software & Gateway Fees.”

They were paying the aggregator a flat 2% fee + 18% GST (effective rate: 2.36%) on every single transaction, regardless of the payment method used by the customer.

The Monthly Math:

Item	Amount
Total GMV	₹65,00,000
UPI Volume (85%)	₹55,25,000
Gateway Fee on UPI Volume (2.36%)	₹1,30,390/month
Gateway Fee on Card + NetBanking (2.36%)	₹23,011/month
Total Gateway Cost	₹1,53,401/month

AuraTech’s UPI volume alone cost them ₹1.3 Lakhs every month. The underlying UPI instrument (savings account-funded P2M) is zero-MDR at the NPCI level — but the aggregator’s platform fee applied on top of it was entirely a function of the contract AuraTech had signed. This is legal and standard practice; aggregators provide real value (fraud detection, webhooks, settlement reconciliation, dispute management). The question AuraTech had to answer was: are we getting ₹1.3 Lakhs per month worth of value from the aggregator specifically for our UPI volume?

The answer was no — especially since T+2 settlement on their UPI volume was creating cash flow delays that required them to maintain a larger working capital buffer.

Implementing the Hybrid Solution

AuraTech decided to split their checkout flow:

• UPI payments would be routed via a direct-to-bank integration, with settlements landing directly in their HDFC current account
• Card and Net Banking payments would continue through their existing Payment Aggregator, where the aggregator’s value (chargeback handling, card network relationships) genuinely justified the fee

Step 1: Bank-Issued Merchant QR and VPA AuraTech’s finance team worked with HDFC to activate a Merchant QR and a VPA (Virtual Payment Address) linked to their corporate current account. The bank performed full KYC as part of this setup.

Step 2: API Integration via VyaparGateway Their tech team integrated VyaparGateway’s API into their React/Node.js storefront. VyaparGateway provides the software layer that generates dynamic UPI Intent links and payment requests mapped to AuraTech’s bank VPA, handles payment status polling via webhooks, and marks orders as paid in their OMS.

They updated the checkout page UI:

• A primary button: “Pay via UPI (Instant & Secure)”
• A secondary button: “Pay via Cards / Net Banking”

Step 3: Routing Logic When a customer clicked the UPI button, the VyaparGateway API generated a dynamic UPI Intent link. The customer completed payment in their preferred UPI app (GPay, PhonePe, Paytm, etc.), the money settled directly into AuraTech’s HDFC account, and a webhook confirmed the order in their backend.

Card and Net Banking transactions continued to flow through the original aggregator without any change.

The Financial Impact & ROI

The integration took the tech team approximately two business days to build, test, and deploy.

New Monthly Math (Post-Integration):

Item	Before	After
Aggregator Fee on UPI (₹55.25L × 2.36%)	₹1,30,390	₹0
Aggregator Fee on Cards + NB (₹9.75L × 2.36%)	₹23,011	₹23,011
VyaparGateway SaaS Subscription	₹0	₹999
Total Monthly Gateway Cost	₹1,53,401	₹24,010
Monthly Savings		₹1,29,391

By restructuring their payment routing, AuraTech reduced their monthly gateway cost by over ₹1.29 Lakhs — an annual saving of approximately ₹15.5 Lakhs, with no change to the customer experience and no impact on card or net banking acceptance.

Additionally, because UPI settlements now landed directly in their bank account (effectively T+0 to T+few-hours, depending on the bank’s processing batch), AuraTech’s working capital cycle improved. Funds that previously sat in the aggregator’s nodal account for 1–2 days were now available immediately, reducing their need for a large operating cash buffer.

Key Takeaways for Growing Indian Merchants

1. Audit your payment mix first. If more than 60% of your volume is UPI funded from bank accounts, you are likely overpaying for your aggregator’s platform fee on those transactions.

2. Zero MDR is at the instrument level, not the platform level. Your aggregator is allowed to charge you a platform fee even on zero-MDR instruments. Read your contract carefully.

3. A hybrid checkout is not technically complex. Routing UPI separately from cards requires roughly 2–3 days of developer time for a custom stack, and is often available as a plugin for WooCommerce or Shopify.

4. Factor in GST. Every gateway fee in India attracts 18% GST, which means a quoted 2% rate is actually a 2.36% effective rate. At ₹50L/month volume, that extra 0.36% compounds to over ₹21,600/month in additional tax.

5. Settlement speed has real financial value. Faster settlement reduces working capital requirements, which has a measurable cost of capital implication — especially for businesses that reinvest in inventory or ad spend.

Optimizing your payment stack is no longer an enterprise-only strategy. In 2026, direct-to-bank routing infrastructure is accessible to businesses of all sizes, and for high-UPI-volume merchants it often delivers the highest ROI of any operational change you can make to your checkout.