diff --git a/README.md b/README.md
index a35b4f3..62c7ce2 100644
--- a/README.md
+++ b/README.md
@@ -60,6 +60,7 @@
 - [How Amazon Lambda Works](https://newsletter.systemdesign.one/p/how-does-aws-lambda-work)
 - [How Amazon S3 Works](https://newsletter.systemdesign.one/p/s3-architecture)
 - [How Do Apple AirTags Work](https://newsletter.systemdesign.one/p/how-do-airtags-work)
+- [How Apple Pay Handles 41 Million Transactions a Day Securely](https://newsletter.systemdesign.one/p/how-does-apple-pay-work)
 
 #### B companies