Blog
Guides on BINs, card payments, chargebacks and fraud prevention.
Fraud PreventionAVS and CVV Checks: How They Work and How to Build Smart RulesHow AVS and CVV verification work, what each response code means, how to build decline and review rules, and the limits of AVS for international cards.October 16, 2026 · 9 minFraud PreventionBIN IP Mismatch: Using Card Country vs IP as a Fraud SignalLearn when a BIN country vs IP geolocation mismatch signals card fraud, how to handle false positives from travel, VPNs and expats, and how to weight it.October 16, 2026 · 10 minChargebacks & DisputesChargeback Reason Codes: Visa, Mastercard, Amex, Discover GuideChargeback reason codes for Visa, Mastercard, Amex and Discover explained: code families, how to respond, what representment evidence wins, and prevention.October 16, 2026 · 9 minPayments & FeesCredit Card Processing Fees Explained: Rates, Models and SavingsUnderstand credit card processing fees: interchange, assessments and markup, flat-rate vs interchange-plus vs tiered pricing, and practical ways to cut costs.October 16, 2026 · 9 minFraud PreventionCard Testing Attacks: How to Detect and Stop Card EnumerationLearn how to detect and stop card testing attacks: key signals, velocity rules, BIN patterns, CAPTCHA, 3-D Secure and monitoring to protect your checkout.October 16, 2026 · 9 minBIN & Cards8-Digit BIN Transition: What Merchants and Developers Must UpdateThe move from 6-digit to 8-digit BINs under ISO/IEC 7812-1:2017 explained: impact on routing, fraud tools, tokenization, PCI masking and reporting.October 16, 2026 · 9 minBIN & CardsLuhn Algorithm Explained: Mod 10 Check with JavaScript and PythonThe Luhn (mod 10) algorithm explained step by step with a worked example, JavaScript and Python code, and a clear look at what it does and does not prove.October 16, 2026 · 9 minPayments & FeesMerchant Category Codes (MCC): The Complete Guide for MerchantsWhat merchant category codes are, how ISO 18245 MCCs affect interchange, card rewards, restrictions and IRS reporting, and how to find the right MCC.October 16, 2026 · 9 minBIN & CardsTest Credit Card Numbers for Developers: A Safe Testing GuideHow developers should use test credit card numbers: Luhn-valid generated numbers vs official gateway sandbox cards, a testing checklist, and PCI DSS tips.October 16, 2026 · 9 minBIN & CardsWhat Is a BIN Number? A Complete Guide to BIN/IIN Card PrefixesLearn what a BIN (IIN) number is, how ISO/IEC 7812 structures card numbers, 6 vs 8-digit BINs, what a BIN reveals, and how merchants use it to fight fraud.October 16, 2026 · 10 minPayments & FeesDynamic Currency Conversion (DCC): Local Currency or Yours?Dynamic currency conversion explained: how DCC works at terminals, ATMs and online, what it costs, the rules for merchants, and which currency to pick.October 13, 2026 · 9 minChargebacks & DisputesChargeback Alerts: Ethoca, Verifi RDR and Order InsightHow chargeback alerts and pre-dispute tools work: Ethoca Alerts, Verifi CDRN, Rapid Dispute Resolution and Order Insight, plus setup tips and ROI tracking.October 9, 2026 · 8 minFraud PreventionVelocity Checks: Fraud Rules That Actually WorkVelocity checks explained: which entities to count, smart time windows, example fraud rules, and how to tune limits so you stop attacks without hurting buyers.October 9, 2026 · 9 minBIN & CardsCheckout Card Validation UX: Best Practices for Card FormsCard validation UX best practices: input attributes, formatting, brand detection, Luhn checks, expiry and CVV rules, error messages, accessibility and mobile.October 8, 2026 · 10 minBIN & CardsCommercial and Corporate Cards: How to Spot Them by BINLearn the types of commercial and corporate cards, how to recognise them from BIN data, and why they matter for interchange, Level 2/3 data and fraud.October 6, 2026 · 9 minFraud PreventionManual Order Review Guide: How to Review Risky OrdersA step-by-step manual order review guide for merchants: what to check on risky orders, how to verify customers politely, and how to decide, document and learn.October 6, 2026 · 8 minBanking, IBAN & SWIFTSEPA Payments Explained: Credit Transfers, Instant, Direct DebitA clear guide to SEPA: which countries take part, how SEPA credit transfers and SEPA Instant work, timelines, fees, direct debits and new EU rules.October 6, 2026 · 8 minPayments & FeesCross-Border Payment Fees: What They Are and How to Cut ThemCross-border card fees explained: what triggers them, how they differ from currency conversion fees, who pays what, and practical ways merchants can cut them.October 5, 2026 · 9 minFraud PreventionE-commerce Fraud Prevention Checklist for Small MerchantsAn e-commerce fraud prevention checklist for small merchants: payment settings, order screening rules, manual review, delivery and chargeback readiness.October 1, 2026 · 9 minChargebacks & DisputesVisa Compelling Evidence 3.0 Explained for MerchantsVisa Compelling Evidence 3.0 explained: which fraud disputes it covers, the 120–365 day rule, matching data elements, how to submit it and capture the data.October 1, 2026 · 8 minBIN & CardsPayment Sandbox Testing Guide: Step-by-Step for DevelopersA step-by-step guide to testing payments in a sandbox: test keys, test cards, declines, 3-D Secure, webhooks, refunds, currencies and a go-live checklist.September 30, 2026 · 9 minPayments & FeesBuy Now, Pay Later (BNPL) for Merchants: Benefits and RisksA merchant guide to buy now, pay later (BNPL): how it works, merchant fees, conversion benefits, refunds and disputes, fraud and compliance risks.September 28, 2026 · 9 minFraud PreventionDevice Fingerprinting Basics: Fraud Prevention and PrivacyDevice fingerprinting basics for merchants: what a device fingerprint is, how it helps stop fraud, its accuracy limits, and how to use it responsibly.September 28, 2026 · 9 minBanking, IBAN & SWIFTInternational Wire Transfer Guide: How It Works, Fees and TimingHow international wire transfers work: the banks involved, OUR/SHA/BEN fees, FX markups, how long transfers take, and how to send money safely abroad.September 28, 2026 · 9 minBIN & CardsCard Number Structure: What Every Digit Means (MII, BIN, Luhn)Card number structure explained digit by digit: the MII, the IIN/BIN, the account number and the Luhn check digit, plus brand prefixes, lengths and PCI rules.September 27, 2026 · 9 minPayments & FeesMerchant Account Guide: What It Is and How to Get OneWhat a merchant account is, how it differs from a business bank account, what underwriters check, the documents you need, and how to get approved faster.September 26, 2026 · 9 minFraud PreventionAccount Takeover in E-commerce: How to Detect and Prevent ItAccount takeover in e-commerce explained: how criminals hijack customer accounts, the warning signs to monitor and layered defences that keep shoppers safe.September 22, 2026 · 9 minChargebacks & DisputesRefund vs Chargeback: Key Differences, Costs and RisksRefund vs chargeback: who starts each one, what each really costs, how they affect your dispute ratio, and when refunding first is the smartest business move.September 22, 2026 · 8 minPayments & FeesHow Card Payments Work: Authorization, Clearing and SettlementHow card payments work step by step: the issuer, acquirer, network and gateway, and what happens during authorization, clearing, settlement and funding.September 21, 2026 · 9 minPayments & FeesPayment Tokenization Explained: PSP, Network and Device TokensPayment tokenization explained: how PSP, network and device tokens replace card numbers, how network tokens work, and what they mean for security and PCI DSS.September 21, 2026 · 8 minBanking, IBAN & SWIFTIBAN vs SWIFT: What Is the Difference and When You Need EachIBAN identifies an account; SWIFT/BIC identifies a bank. Learn the difference, which one each country and payment needs, and how to fill in transfers right.September 20, 2026 · 8 minBIN & CardsVirtual Cards Explained: Uses for Consumers and BusinessesWhat virtual cards are, how single-use and merchant-locked cards work, how businesses use them for payables, and what merchants see when one is used.September 20, 2026 · 9 minFraud PreventionVPN and Proxy Detection at Checkout Without False PositivesA merchant guide to VPN and proxy detection at checkout: what the signals mean, why most VPN users are legitimate, and how to respond without losing good sales.September 20, 2026 · 9 minPayments & FeesPayment Gateway vs Processor vs Acquirer: Who Does WhatPayment gateway vs processor vs acquiring bank explained: what each one does in a card payment, how money flows, who carries risk, and how to choose a setup.September 17, 2026 · 9 minBIN & CardsVisa vs Mastercard: Differences for Cardholders and MerchantsVisa vs Mastercard compared: acceptance, card numbers, card tiers, security, currency conversion, chargeback rules and fees, for cardholders and merchants.September 15, 2026 · 9 minChargebacks & DisputesChargeback Ratio: Visa and Mastercard Monitoring ProgramsWhat a chargeback ratio is, how Visa VAMP and Mastercard's Excessive Chargeback Program measure it, what happens if you breach a limit, and how to stay safe.September 13, 2026 · 9 minFraud PreventionFriendly Fraud Prevention: Causes, Warning Signs and FixesFriendly fraud prevention guide: why real cardholders dispute legitimate orders, the main causes, the evidence that wins disputes and how to stop it early.September 13, 2026 · 9 minPayments & FeesDigital Wallets for Merchants: Apple Pay and Google Pay GuideApple Pay and Google Pay for merchants: how wallet tokens work, in-store and online checkout, fees, chargebacks, fraud signals and a launch checklist.September 12, 2026 · 9 minFraud PreventionIP Geolocation in Fraud Detection: Uses, Accuracy and LimitsHow IP geolocation helps fraud detection, how accurate country and city data really is, where it misleads, and how to combine it with other signals safely.September 12, 2026 · 9 minFraud PreventionPCI DSS for Small Merchants: A Practical Compliance GuidePCI DSS compliance explained for small merchants: merchant levels, the 12 requirements, choosing the right SAQ, shrinking scope and avoiding costly mistakes.September 12, 2026 · 9 minBanking, IBAN & SWIFTSWIFT/BIC Code Explained: Format, Meaning and How to Find OneWhat a SWIFT/BIC code is, how its 8 or 11 characters identify a bank and country, why it matters for international transfers, and how to find the right one.September 12, 2026 · 9 minBIN & CardsCard Levels Explained: Classic, Gold, Platinum, Signature & MoreCard levels explained: what Classic, Gold, Platinum, Signature, Infinite and World Elite mean, how they differ in benefits, and why they cost merchants more.September 9, 2026 · 9 minPayments & FeesInterchange-Plus vs Flat-Rate vs Tiered Pricing ComparedInterchange-plus vs flat-rate vs tiered pricing: how each card processing model works, what it really costs, and how to choose the right one for your business.September 8, 2026 · 9 minFraud Prevention3-D Secure 2 Explained: Frictionless Flow, Challenges & Liability3-D Secure 2 explained for merchants: how EMV 3DS works, frictionless vs challenge flows, ECI and status codes, SCA exemptions and the liability shift.September 4, 2026 · 10 minBIN & CardsContactless Payments (NFC): How Tap to Pay Works and Is It Safe?How contactless NFC card payments work, from the tap to the issuer's approval, why they resist cloning, the real risks, and what merchants should know.September 4, 2026 · 10 minFraud PreventionPrepaid Card Risk: A Merchant Guide to Prepaid and Gift CardsPrepaid card risk explained for merchants: why prepaid and gift cards attract fraud, how to spot them by BIN, and how to manage risk without losing customers.September 4, 2026 · 9 minBanking, IBAN & SWIFTWhat Is an IBAN? Structure, Format and How to Validate ItLearn what an IBAN is, how its country code, check digits and BBAN fit together, how the mod 97 check works, and how to avoid failed or misdirected payments.September 4, 2026 · 9 minChargebacks & DisputesWin Chargebacks: A Step-by-Step Representment GuideLearn how to win chargebacks with representment: deciding which disputes to fight, building evidence per reason code, writing rebuttals and meeting deadlines.September 4, 2026 · 9 minBIN & CardsBIN Lookup API Guide: Add Card Intelligence to Your CheckoutLearn how to integrate a BIN lookup API into checkout with JavaScript and Python examples, caching, fail-open design, fraud rules and PCI-safe data handling.September 3, 2026 · 10 minBIN & CardsCredit vs Debit vs Prepaid Cards: Key Differences ExplainedCredit vs debit vs prepaid cards compared: where the money comes from, fees, fraud protection, holds, chargebacks and what each card type means for merchants.September 3, 2026 · 10 min