When a customer places an order on the website is an example of asynchronous communication in an e-commerce application. 

When the customer submits their order, the microservice that handles the order sends a message to a separate microservice that handles payment processing. 

The payment microservice processes the payment and sends a confirmation message back to the order microservice, which updates the order status and sends a confirmation email to the customer. This process involves asynchronous communication between the two microservices. 

https://www.ringcentral.com/gb/en/blog/definitions/asynchronous-communication/