Add payments

Author: charlax

README.md

@@ -16,6 +16,7 @@
     - [Automation](#automation)
     - [Beyond software engineering & random](#beyond-software-engineering--random)
     - [Biases](#biases)
+    - [Business](#business)
     - [Cache](#cache)
     - [Career growth](#career-growth)
       - [Getting to Staff Eng](#getting-to-staff-eng)
@@ -364,6 +365,10 @@ Biases don't only apply to hiring. For instance, the fundamental attribution bia
 
 - [Cognitive bias cheat sheet](https://betterhumans.coach.me/cognitive-bias-cheat-sheet-55a472476b18#.6temb6hyg). #hiring
 
+### Business
+
+- [Payments 101 for a Developer](https://github.com/juspay/hyperswitch/wiki/Payments-101-for-a-Developer)
+
 ### Cache
 
 - [Caching challenges and strategies](https://aws.amazon.com/builders-library/caching-challenges-and-strategies/), Amazon Builders Library