#Card Payments

Articles about Card Payments — exploring patterns, best practices, and real-world implementations in production systems.

12 posts tagged with card payments. ← All posts

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Pratik Dhanave · ·6 min read

Card Authorization, Capture, and Clearing: One Transaction, Three Money States

How to model the card payment as a two-phase auth-then-capture flow plus a clearing tail — handling incremental auths, partial captures, reversals, expiry, and the auth-vs-settled reconciliation that trips up every ledger.

Teaches how to model the card transaction as a two-phase (auth then capture) plus clearing/settlement state machine, handling partial captures, incremental auths, auth expiry/reversal, and the auth-vs-settled amount reconciliation.

#Fintech#Payments#Cards#Financial Systems#Distributed Systems#Card Payments
Pratik Dhanave · ·6 min read

Integrating 3-D Secure 2 Without Breaking Your Checkout

Wiring the 3DS Server, Directory Server, and issuer ACS into a handshake that produces a cryptogram your authorization message can carry.

Teaches how to integrate 3-D Secure 2: the 3DS Server, Directory Server and issuer ACS handshake, frictionless vs challenge decisioning, device data collection, and liability-shift outcomes feeding the authorization.

#Fintech#Payments#Cards#Financial Systems#Distributed Systems#Card Payments
Pratik Dhanave · ·6 min read

Network Tokenization and How a Token Vault Shrinks Your PCI-DSS Scope

How a token vault and scheme-issued network tokens push the raw PAN out of your application systems, so most of your services fall out of PCI-DSS scope entirely.

Teaches how a token vault and network tokens (TR-31/EMV payment tokens) remove PAN from application systems, cutting PCI-DSS scope, and how token provisioning, cryptograms, and detokenization boundaries are architected.

#Fintech#Payments#Cards#Financial Systems#Distributed Systems#Card Payments
Pratik Dhanave · ·6 min read

Building a Deterministic Interchange Fee Engine

Turn card transaction attributes into interchange, scheme, and markup lines that reconcile to the cent.

Teaches how to build a deterministic fee engine that classifies each transaction into an interchange category (regulated debit, rewards, CPS qualification) and computes interchange + scheme + acquirer markup for merchant statements.

#Fintech#Payments#Cards#Financial Systems#Distributed Systems#Card Payments
Pratik Dhanave · ·6 min read

Modeling Card Chargebacks as a State Machine

Modeling the full card dispute lifecycle with reason codes, evidence deadlines, representment, arbitration, and provisional-credit ledger entries at every transition.

Teaches how to model the full card dispute lifecycle as a state machine with reason codes, evidence deadlines, representment, pre-arbitration and arbitration, and provisional-credit ledger entries at each transition.

#Fintech#Payments#Cards#Financial Systems#Distributed Systems#Card Payments

All posts on this site are written by Pratik Dhanave, an Agentic AI Architect with 7+ years building production distributed systems, multi-agent AI platforms, and cloud-native infrastructure. About the author → Each article includes working code, architecture diagrams, and references to the specific frameworks and standards discussed. Browse all posts or explore related topics using the tag cloud above.