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D2C · E-commerce · Marketplace · Headless Commerce

Survive the
Marketplace Security Audit

PCI DSS v4.0 wherever card data lands, DPDP Act 2023 across the customer-data inventory, fraud and abuse prevention against the threat models that actually drain D2C P&Ls, and the Flipkart Marketplace / Amazon / Razorpay partner-program security audits buyer-side procurement now demands. Built for Series A+ Indian D2C brands and marketplace platforms — fashion, beauty, food, wellness, headless commerce.

31 Mar 2025
PCI DSS v4.0 client-side script-integrity controls (6.4.3 / 11.6.1) became mandatory
₹250 cr
maximum DPDP Act penalty per breach for a Data Fiduciary
21
OWASP Automated Threats (OAT-001 to OAT-021) tested as real business flows
Magecart
client-side card-skimming is the dominant checkout-page breach pattern

Why D2C and e-commerce need a different playbook

Indian D2C and e-commerce sit at the intersection of three pressures that did not exist a decade ago. First, payment-card data: PCI DSS v4.0 became the only valid standard from 31 March 2024, and its 31 March 2025 deadline added the new client-side script integrity controls (requirement 6.4.3 and 11.6.1) that catch Magecart-style form-jacking. Second, the DPDP Act 2023: every D2C brand is a Data Fiduciary processing personal data of Indian customers, with breach-notification timelines to the Data Protection Board of India and penalties up to INR 250 crore per breach. Third, marketplace partner-program audits: Flipkart, Amazon, Myntra, Nykaa, Tata Cliq, JioMart and the platform-side payment processors (Razorpay, Cashfree, PayU, Pine Labs) all run third-party security reviews before a brand can scale on the platform — and the report they ask for has to be recent, has to be operator-signed and has to map cleanly to their requirement matrix.

Underneath those three pressures sits the bug class D2C engagements actually see: business-logic abuse. Coupon-stacking, gift-card double-spend, refund-loop manipulation, referral-self-abuse, OTP enumeration, account-takeover via phone-rebind, address-book pollution, bot-driven inventory drain on flash sales — none of which a generic OWASP Top 10 sweep catches, and all of which directly hit the P&L. AxVeil's D2C engagement model is built around all four — payment data, personal data, partner-program reviewability, and the abuse classes that a working risk engine has to defend.

Attack scenarios exercised

The abuse classes that hit a D2C P&L directly — tested as real flows with reproducible PoCs, not flagged by a scanner.

THREAT
Magecart form-jacking on the checkout page
Inventory every third-party script on the checkout DOM, then demonstrate the form-jacking path a skimmer takes when script integrity is not enforced. Validates the PCI DSS v4.0 requirement 6.4.3 / 11.6.1 client-side controls — the exact pattern behind the British Airways, Ticketmaster and Newegg breaches. SAQ-A-EP and SAQ-D scope.
THREAT
Business-logic abuse: coupon-stack, gift-card double-spend, refund loop
Test the actual money-touching flows — coupon stacking, referral self-abuse, gift-card double-spend, address-book pollution to re-trigger first-order discounts, refund-loop manipulation via partial-cancel and split-shipment. The OWASP Automated Threats catalogue as the structural reference. PoCs come with risk-engine and rate-limit remediation, not a CAPTCHA recommendation.
THREAT
PSP webhook forgery and tokenisation-boundary bypass
Razorpay / Cashfree / PayU / Stripe integration tested for unsigned or replayable payment webhooks, order-amount tampering between client and PSP, and token-to-PAN boundary leakage. The path that turns a ₹1 test order into a fulfilled ₹50,000 one, or a refund webhook into free store credit.

The four drivers behind a D2C engagement

1. PCI DSS v4.0 (where card data lands)

SAQ-A for full-iframe checkout, SAQ-A-EP where the card form renders in your DOM via a tokenisation SDK, SAQ-D wherever a primary account number actually touches your servers. PCI DSS v4.0 31-March-2025 controls — including client-side script integrity under 6.4.3 / 11.6.1 to catch Magecart — apply to SAQ-A-EP and SAQ-D. AxVeil scopes the correct SAQ category up front and tests against the actual control set.

2. DPDP Act 2023 (every Indian customer record)

Data Fiduciary obligations: lawful processing, consent capture, purpose limitation, retention timelines, breach notification to the Data Protection Board within prescribed windows, published grievance officer. Penalties up to INR 250 crore per breach. Includes alignment with the dark-pattern guidelines under the Consumer Protection Act 2019.

3. Marketplace partner-program audits

Flipkart Marketplace third-party security review, Amazon vendor / developer security review, Myntra / Nykaa / Tata Cliq / JioMart vendor onboarding, Razorpay / Cashfree / PayU / Pine Labs platform-partner audits. Each asks for a recent independent VAPT, evidence of remediation on Critical and High findings, encryption and access-control architecture, and a security-questionnaire response.

4. Business-logic abuse and fraud

OWASP Automated Threats catalogue (OAT-001 through OAT-021) — credential stuffing, account creation abuse, scraping, sniping, vulnerability scanning, ad fraud, denial of inventory, expediting, footprinting, scalping. Tested as actual business flows with reproducible PoCs and remediation guidance at risk-engine and rate-limit-redesign level.

Standards & reference material

PCI DSS v4.0.1

link ↗

Payment Card Industry Data Security Standard v4.0.1 — the only valid standard for card-data handling. New client-side script integrity controls (6.4.3, 11.6.1) mandatory from 31 March 2025. Self-assessment questionnaires (SAQ-A / SAQ-A-EP / SAQ-D) determine the applicable control subset.

DPDP Act 2023 (India)

link ↗

Digital Personal Data Protection Act 2023 with operative DPDP Rules following in 2025. Data Fiduciary obligations on lawful processing, consent, purpose limitation, retention, breach notification and grievance officer. Significant Data Fiduciary tier triggers DPIA and DPO obligations. Penalties up to INR 250 crore per breach.

OWASP Automated Threats to Web Applications (OAT)

link ↗

Catalogue of 21 automated-threat events seen against e-commerce and consumer applications. Structural reference for fraud, abuse and bot-driven attack testing — credential stuffing (OAT-008), scraping (OAT-011), denial of inventory (OAT-021), expediting (OAT-006), scalping (OAT-005) and so on.

OWASP API Security Top 10 (2023)

link ↗

BOLA, broken authentication, BOPLA, unrestricted resource consumption, BFLA, unrestricted access to sensitive business flows, SSRF, security misconfiguration, improper inventory management, unsafe consumption of APIs. Applied across storefront-to-platform-to-PSP API boundaries on headless-commerce stacks.

Consumer Protection Act 2019 — dark-pattern guidelines

link ↗

CCPA dark-pattern guidelines (2023) prohibit thirteen named patterns including false urgency, confirm-shaming, basket-sneaking, subscription traps and forced action. Reviewed alongside DPDP consent architecture during the engagement.

AxVeil D2C engagement model

A typical Series A+ D2C engagement runs as a 4-week cycle (storefront + checkout + admin + cloud + mobile if applicable) followed by an annual repeat and quarterly retests on Critical / High remediations. AxVeil contracts directly — DPDP advisory and PCI DSS support do not require CERT-In empanelment.

Week 0 — Scoping
Confirm asset inventory, SAQ category (A / A-EP / D), payment processor and card-data flow, marketplace partners requiring an audit deliverable, mobile platforms, in-scope cloud accounts, test-account provisioning. Rules of Engagement signed; rate-limit testing window agreed with Bot Manager / WAF vendor.
Week 1 — Recon & automated discovery
Subdomain and JavaScript route mining, third-party script inventory (Magecart vector hunting), API schema extraction (OpenAPI / GraphQL SDL where available), dependency CVE correlation against the SBOM, perimeter Nuclei sweep. All output is candidate-only.
Week 2-3 — Manual application + business-logic testing
OWASP ASVS L2 across storefront, customer portal, admin console, mobile apps. OWASP API Top 10 across the storefront-to-platform-to-PSP API surface. OWASP Automated Threats — credential stuffing, scraping, denial of inventory, expediting, scalping, account-creation abuse. Coupon, refund, gift-card, referral, address-book, OTP, account-takeover business-logic flows tested with reproducible PoCs.
Week 3 — Cloud, edge & PSP integration
AWS / GCP / Azure control-plane review against CIS Benchmarks. CDN / WAF (Cloudflare / Akamai / CloudFront) configuration review. Edge-function and middleware authorisation testing on Next.js / Remix / Astro stacks. PSP integration (Razorpay / Cashfree / PayU / Stripe) tested with focus on tokenisation boundary and webhook signature handling.
Week 4 — Reporting & marketplace audit pack
Single PDF (60–120 pages) plus the marketplace-audit response pack — formatted for Flipkart Marketplace, Amazon vendor review, Razorpay platform-partner review, or whichever partner has asked for the report. PCI DSS v4.0 control-mapping appendix, DPDP Act 2023 personal-data-inventory and consent-architecture appendix, JSON export for Jira / Linear / GitHub Security.
Week 4-8 — Remediation & retest
Remediation owned by your engineering team. One free retest of every Critical, High and Medium finding marked remediated. Retest report appended to the original PDF; updated marketplace-audit pack issued for the partner-program reviewer.

Sample artefacts handed back

Pentest PDF (60–120 pages)
Executive summary, technical findings with CVSS v3.1 + v4.0, ASVS / API Top 10 / OAT / CWE mapping, reproduction steps, remediation guidance with code samples, PCI DSS control-mapping appendix, DPDP Act personal-data-inventory appendix, retest section.
Marketplace-audit response pack
Tuned to the partner asking for it — Flipkart Marketplace, Amazon vendor review, Myntra / Nykaa / Tata Cliq onboarding, Razorpay / Cashfree platform-partner review. Drop-in answers to the questionnaire plus the supporting evidence file the reviewer will demand.
PCI DSS v4.0 readiness pack
SAQ category determination memo, control-applicability matrix, evidence index, gap-remediation backlog. Where the merchant qualifies for self-assessment, AxVeil supports the SAQ filing and the Attestation of Compliance preparation. Where a Qualified Security Assessor is required (typically Level 1 merchants), AxVeil hands over a full evidence pack ready for the QSA engagement.
DPDP Act 2023 evidence pack
Personal-data inventory, lawful-basis matrix per processing purpose, consent-architecture diagram with dark-pattern review, retention-timeline policy, breach-notification runbook (Data Protection Board timeline plus the affected Data Principal communication), grievance-officer mandate.
Fraud and abuse model document
OWASP Automated Threats matrix scored against the engagement's findings. Risk-engine signal recommendations, rate-limit redesign proposals, Bot Manager / WAF rule-tuning suggestions and where applicable a working scoring rubric for the in-house fraud team. Designed to reduce abuse-driven P&L leakage, not just to add CAPTCHA.
Letter of Attestation
Signed PDF referencing engagement scope, dates, ASVS level achieved, lead-tester credentials and report hash. The artefact you forward to marketplace partner-program reviewers and to enterprise B2B buyers as evidence of the work.

Related work

Frequently asked questions

Do we actually need PCI DSS if we use Razorpay or Stripe and never see a card number?+

Probably not the full SAQ-D, but you almost always inherit something. If your checkout iframes or redirects to a PCI-compliant payment processor and your servers never touch a primary account number, SAQ-A applies — fewer than two dozen controls, but you still have to attest annually and you still have to control the iframe origin, the JavaScript on the checkout page (Magecart and form-jacking are the dominant client-side card-skimming patterns), and the redirect URL. If you use a hosted payment page but render the card form in your own DOM through a tokenisation SDK, SAQ-A-EP applies and the requirement set roughly triples — including PCI DSS v4.0's new client-side script integrity controls under requirement 6.4.3 and 11.6.1, mandatory from 31 March 2025. If you ever store, process or transmit a primary account number on your infrastructure (subscription rebilling on file, B2B invoicing with stored cards, in-house point-of-sale) you are in SAQ-D territory. AxVeil scopes the SAQ category up front and tests against the actual control set, not a generic checklist.

What does the DPDP Act 2023 add for an Indian D2C brand?+

The Digital Personal Data Protection Act 2023 — operative through the 2025 DPDP Rules — makes every D2C brand processing personal data of Indian customers a Data Fiduciary. Obligations: lawful processing with explicit consent, purpose limitation, data minimisation, accuracy, retention discipline, breach notification to the Data Protection Board of India and to affected Data Principals, and a published grievance officer. Penalties run up to INR 250 crore per breach. D2C brands sit on a particularly rich personal-data set — name, address, phone, email, purchase history, behavioural analytics, often payment-card tokens, sometimes Aadhaar for KYC-style flows. We map the data inventory, the lawful basis per processing purpose, the consent architecture (including the dark-pattern controls under the Consumer Protection Act 2019 dark-pattern guidelines), retention timelines and the breach-notification runbook. No CERT-In empanelment required for DPDP advisory; AxVeil contracts directly.

What do Flipkart Marketplace, Amazon and Razorpay actually look for in their partner-program security audits?+

Flipkart's third-party seller security review covers data-handling, network controls, identity and access management, vulnerability management cadence (annual VAPT minimum, retest evidence on critical findings), encryption, audit logging and incident response. Amazon's third-party developer / vendor reviews are similar but emphasise Personally Identifiable Information protection and the AWS shared-responsibility model where the vendor builds on AWS. Razorpay's vendor review for high-volume merchants and platform partners overlaps both, plus a deeper look at fraud, refund-abuse and chargeback controls. The artefact each ask for is broadly the same: a recent independent VAPT report (typically less than 12 months old), evidence of remediation on Critical and High findings, the encryption and key-management architecture, the access-control model, the breach-notification policy and a security questionnaire response. AxVeil produces all of those in a single engagement cycle.

How do you handle fraud, coupon abuse, refund manipulation and bot abuse?+

These sit between application security and business-logic abuse — exactly the bug class that scanner-only testing misses. We test the actual business flows: registration with disposable emails, OTP enumeration, coupon-stacking and referral-self-abuse, gift-card double-spend, address-book pollution to bypass first-order discounts, refund-loop manipulation through partial-cancel and split-shipment, bot-driven scraping of price and inventory, credential-stuffing against logged-in flows, and account takeover via password-reset and phone-binding bypass. The OWASP Automated Threats catalogue (OAT-001 to OAT-021) is the structural reference. Findings come with reproducible PoCs and recommendations on Bot Manager configuration, rate-limit redesign and risk-engine signal additions — not just "add CAPTCHA".

Do you cover headless commerce, microservices and the edge layer?+

Yes. Headless-commerce stacks (Commercetools, Saleor, Medusa, custom Spree or Sylius forks) are tested via OWASP API Top 10 across the storefront-to-platform-to-PSP API surface. The presentation layer — Next.js / Remix / Astro on Vercel, Netlify or self-hosted edge — gets its own scope: middleware authorisation, edge-function trigger abuse, ISR cache poisoning, server-action exploitation, third-party script integrity (the Magecart vector). Microservices behind the storefront are covered as authenticated REST / GraphQL / gRPC tests with cross-service trust-boundary mapping. CDN and WAF (Cloudflare, Akamai, AWS CloudFront + WAF, Imperva) get a configuration review against vendor benchmarks and the OWASP CRS rule set.

How fast can a Series A+ D2C engagement run?+

Standard 4-week cycle: week 1 scoping plus reconnaissance, week 2-3 active testing (web, mobile, API, cloud), week 4 reporting plus a free retest within 30 days of remediation. PCI DSS SAQ-A or SAQ-A-EP attestation work runs in parallel — no extra cycle. If marketplace partner-program audit pressure is acute (the Flipkart / Amazon / Razorpay reviewer asked for a report by a fixed date), we compress to a 2-week cycle on the Critical Path scope (checkout, payment integration, account access, customer data API) and follow up with a complete cycle the following month.

Scope a D2C engagement

Send the storefront URL, the payment processor, the marketplace partners asking for an audit deliverable, the mobile platforms in scope and the cloud (AWS / GCP / Azure). We respond with a fixed-fee proposal, the SAQ-category determination, and a redacted sample report from a comparable engagement under NDA.

Request a scoping call