sequenceDiagram
    actor customer
    participant order_s as order <br> microservice
    participant product_s as product <br> microservice
    participant customer_s as customer <br> microservice
    customer ->> order_s: /post orders
    order_s ->> product_s: order created pending
    product_s -->> customer_s: product(s) are reserved
    customer_s -->> order_s: money reserved
    order_s -->> customer: order approved