Payments Academy
Channels: places where payment starts 1 Channels NOW 2 Payment instruction 3 Critical piece 4 De-duplication 5 Rate limiting Channels are the places where a payment starts. Step 1 of 5 Channels: places where payment starts 1 NOW Channels 2 Payment instruction 3 Critical piece 4 De-duplication 5 Rate limiting Channels are the places where a payment starts. Step 1 of 5
Payment instruction 1 Channels 2 Payment instruction NOW 3 Critical piece 4 De-duplication 5 Rate limiting A payment instruction that needs to be processed. Step 2 of 5 Payment instruction 1 Channels 2 NOW Payment instruction 3 Critical piece 4 De-duplication 5 Rate limiting A payment instruction that needs to be processed. Step 2 of 5
Critical piece 1 Channels 2 Payment instruction 3 Critical piece NOW 4 De-duplication 5 Rate limiting This is a critical piece of design, because every channel speaks a different language. Step 3 of 5 Critical piece 1 Channels 2 Payment instruction 3 NOW Critical piece 4 De-duplication 5 Rate limiting This is a critical piece of design, because every channel speaks a different language. Step 3 of 5
De-duplication 1 Channels 2 Payment instruction 3 Critical piece 4 De-duplication NOW 5 Rate limiting It also handles de-duplication, because the same payment can arrive twice when a channel retries, Step 4 of 5 De-duplication 1 Channels 2 Payment instruction 3 Critical piece 4 NOW De-duplication 5 Rate limiting It also handles de-duplication, because the same payment can arrive twice when a channel retries, Step 4 of 5
Rate limiting 1 Channels 2 Payment instruction 3 Critical piece 4 De-duplication 5 Rate limiting NOW It may apply rate limits to protect the hub from a flood of requests Step 5 of 5 Rate limiting 1 Channels 2 Payment instruction 3 Critical piece 4 De-duplication 5 NOW Rate limiting It may apply rate limits to protect the hub from a flood of requests Step 5 of 5

Steps of this lesson, in order.

0:00 / 1:59 Step 1 of 5

Channels and the Gateway

Payment Hub Architecture, Lesson 2 of 8, Narration 1:59, D09 Payment architecture and technology

Host to hostGatewayAPI

What you will learn

Your objective. By the end of this lesson, you will be able to explain channels and the gateway. Channels are the places where a payment starts.

Why it matters. This matters because the architecture decides what the bank can build, how fast it can change, and where a payment can fail. Most payment requirements live in the architecture.

Chapter objective: Learner designs a payment hub architecture, explaining intake, validation, routing, transformation, screening, and settlement modules, and maps a payment through each module. Learner applies this skill in realistic banking scenarios, with clear examples and correct terminology throughout.

Key learning points

  • Channels: places where payment starts
  • Payment instruction
  • Critical piece
  • De-duplication
  • Rate limiting

Key terms

Host to host: A direct file or API connection between a corporate customer system and its bank, used to send payment files and receive status reports.

Gateway: A service that connects a merchant website or app to payment networks and acquirers. It encrypts card data, routes authorisation requests, and returns the result to the merchant.

API: Application programming interface, a set of rules that lets one software system call another system to request data or trigger an action.

Banking architecture diagram showing Channels and the Gateway.

Practise this lesson

Exercise

Read ch48s1 Hub components: what a hub is and what it contains. Then trace a EUR 100,000 supplier payment from the online banking channel to the rail.

ch48s1 covers channels, the gateway, the hub core, and routing. The gateway validates and enriches. The hub core routes by currency, amount and urgency.

  1. What to do. Name each component the payment passes through and what it does, and name the rail for a EUR 100,000 euro payment to Germany.

Correct result. Online banking captures the instruction. The gateway validates the format and enriches the beneficiary details. The hub core checks limits and sanctions and routes by currency and amount. A EUR 100,000 euro payment to Germany goes through T2 as a SEPA Credit Transfer.

Why. The gateway is the door, the hub is the building. A gateway validates and converts, but it never routes, screens or settles.

Check your understanding

Practice question

What is the difference between a gateway and a payment hub?

Takeaway and next step

What to remember

Read ch48s1 for the full treatment, including the routing decision that sends each payment to the right rail or correspondent.

Send a payment through the hub and watch it pass each component named in this lesson.

Open the Payment Hub Architecture Simulator →

Builds on "What a Payment Hub Is and Why Banks Build One".

Transcript and full text

Show transcript

This topic now lives in ch48s1 Hub components: what a hub is and what it contains, which is the master lesson for the payment hub. Channels are the places where a payment starts, and the gateway is the component that receives instructions from all channels, converts them into a single internal format, validates the message structure, rejects malformed instructions and checks for duplicates. Read ch48s1 for the full treatment, including the routing decision that sends each payment to the right rail or correspondent.

This topic now lives in ch48s1 Hub components: what a hub is and what it contains, which is the master lesson for the payment hub. Channels are the places where a payment starts, and the gateway is the component that receives instructions from all channels, converts them into a single internal format, validates the message structure, rejects malformed instructions and checks for duplicates. Read ch48s1 for the full treatment, including the routing decision that sends each payment to the right rail or correspondent.

Full lesson text (all scenes)

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