Module 3: How Credit Card Processing Actually Works (Authorization to Settlement)

What actually happens in the two seconds after you tap a card?

A card transaction looks instant. Behind the curtain it touches the merchant, the acquirer, the network, the issuer, the fraud engine, and at least one settlement system, all within a handful of seconds. This module is the step-by-step walkthrough of that flow, from the first authorization request to the moment funds land in the merchant's bank account days later. The goal is operational literacy: a finance or product leader who can describe exactly what is happening at each step and where the money, the risk, and the latency live.

What you'll learn in this module

• The full authorization sequence, including the role of the gateway, processor, network switch, and issuer authorization host
• The distinction between authorization, clearing, and settlement, and why a transaction can pass authorization and still fail to settle
• How chargebacks, retrieval requests, and representments work in the days and weeks after settlement
• Where decline reasons originate, how to read declined transaction data, and what the merchant can and cannot do about each class of decline
• The economics of merchant pricing models (interchange-plus, blended, tiered) and how to translate any pricing sheet back to the underlying network and issuer costs

The complete module includes worked examples of authorization flows, decline taxonomies, and the merchant-side controls that meaningfully change approval rates.