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PCI DSS v4.0 · Scope reduction · Segmentation & logging · Assessment-ready evidence

PCI DSS-Compliant App Development

Build payment apps that keep card data safe and your PCI DSS scope small: tokenized payments, segmented systems, strong access control, logging and evidence for your assessment.

The cheapest PCI DSS compliance is the card data you never touch. Every system that stores, processes or transmits card numbers adds controls, audits and risk.


Codersarts PCI DSS-compliant app development designs payment systems to minimize scope, then builds the controls and evidence your assessment needs for what remains.




What Is PCI DSS?


The Payment Card Industry Data Security Standard (PCI DSS) sets security requirements for any organization that stores, processes or transmits cardholder data. Version 4.0 covers network security, data protection, vulnerability management, access control, monitoring, testing and security policies. Merchants prove compliance through a Self-Assessment Questionnaire (SAQ) or an assessment by a Qualified Security Assessor (QSA).

We build the technical controls and help prepare evidence. Formal validation is done through your SAQ or a QSA.



Who This Is For


  • Fintech and payment companies handling card data

  • SaaS and e-commerce products asked about PCI

  • Marketplaces and platforms processing payments

  • Companies moving from direct card handling to tokenization

  • Teams preparing for a PCI assessment



What We Build


Scope reduction

Hosted fields and tokenization so card data stays with your provider. See payment gateway integration.


Segmentation

Separating any card data environment from other systems.


Access control

MFA, least privilege and unique accounts. See login hardening.


Logging and monitoring

Centralized, tamper-resistant logs with alerts.


Vulnerability management

Scanning, patching and secure development. See vulnerability scans.


Script protection

Controls on payment page scripts, a key PCI DSS v4.0 requirement.


Evidence

Documentation and evidence mapped to requirements.



Common SAQ Types


SAQ

Typical setup

Scope

SAQ A

Fully outsourced, hosted payment page or redirect

Smallest

SAQ A-EP

Your page loads payment fields from the provider

Small, includes your web page

SAQ D

You store, process or transmit card data

Full PCI DSS requirements


Moving from SAQ D to SAQ A or A-EP through tokenization often removes most of the compliance burden.



Common PCI Problems We Fix


Problem

Usual cause

Fix

Card numbers in logs or databases

Direct card handling

Unknown scripts on payment pages

No script control

Shared admin accounts

Weak access control

Unpatched systems

No vulnerability process



How Much Does PCI DSS Work Cost?


Cost depends mostly on your scope: reducing it is usually cheaper than securing a full card data environment. QSA and scanning fees are separate.


Scope

Typical timeline

Typical cost

PCI gap review

1 to 2 weeks

$2,000 to $6,000

Scope reduction with tokenization

3 to 8 weeks

$8,000 to $30,000

Controls for a full card data environment

2 to 6 months

$30,000 to $120,000+


What changes the cost: whether you store card data, number of systems in scope, segmentation, logging, testing and the SAQ or QSA level required.


Ranges are typical for a global team. Your price is fixed after scoping, before any work starts.


Ways to Start Small

Starting point

Best for

From

A first look at vulnerabilities

$199

A ranked bug list for an existing platform

$199

Ongoing fixes with a fixed budget

$290 for 10 hours




How We Work


  1. Map card data. Where card data enters, flows and is stored.

  2. Reduce scope. Tokenize and remove card data where possible.

  3. Build controls. Access, logging, segmentation and scanning.

  4. Test. Vulnerability scans and penetration testing.

  5. Document. Evidence mapped to requirements.

  6. Support assessment. Help with SAQ or QSA questions.



What You Receive


  • A card data flow map

  • Reduced PCI scope

  • Technical controls built

  • Testing results

  • Evidence for your assessment



Example Engagement: From SAQ D to SAQ A-EP


An illustrative example based on the pattern we see most often. Client details are kept confidential.


The situation: A subscription business collected card numbers through its own forms and stored them encrypted, putting its whole platform in PCI scope.


What we did:


  • Moved to provider-hosted payment fields and tokens

  • Deleted stored card numbers after migrating to tokens

  • Added script controls and logging on payment pages


The result: The company's assessment moved to a much smaller questionnaire, and card numbers no longer touched its servers.



Mistakes to Avoid


  • Storing card numbers you don't need

  • Logging full request bodies on payment endpoints

  • Ignoring third-party scripts on payment pages

  • Treating PCI as a yearly project



Why Codersarts


  • Payments, security, cloud and AI engineers in one team

  • Money movement designed for correctness, not just the happy path

  • Fixed-price tasks for small jobs, so you can start without a large contract

  • Plain-language documentation for partner and bank reviews

  • You own all code, data and accounts



Frequently Asked Questions


Do we need PCI DSS compliance?

If you accept card payments, yes, though tokenized checkout can make your requirements much smaller.

Stronger authentication, payment page script controls and more continuous security practices, among other changes.

No. A QSA or your SAQ validates compliance; we build controls and prepare evidence.

Use hosted payment fields or redirects and tokens so card data never touches your systems.



Related Pages




Keep Card Data Out of Your Systems


Tell us how you accept cards today, and we'll show you how to shrink your PCI scope.


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