The mind map below shows an extensive outline of payment knowledge. 

This gives us 𝐚 𝐭𝐨𝐩-𝐝𝐨𝐰𝐧 𝐯𝐢𝐞𝐰 𝐨𝐟 𝐭𝐡𝐞 𝐢𝐧𝐝𝐮𝐬𝐭𝐫𝐲 and an overview of how the payment systems work.

Notice that different countries have different payment frameworks. But in general, the payment industry is composed of below parts:

🔹 Regulatory Authority
🔹 Central Bank
🔹 Commercial Banks
🔹 Non-Bank Payment Companies
🔹 Payment Systems
🔹 Clearing Networks
🔹 Settlement Systems

▶️ 𝐌𝐨𝐫𝐞 𝐔𝐬𝐞𝐟𝐮𝐥 𝐌𝐚𝐭𝐞𝐫𝐢𝐚𝐥𝐬 for your reference:
- Payment Systems in the U.S. by GlenBrook
- BIS (Bank for International Settlements) Website
- PayPal documents
- Stripe documents
- SWIFT documents