Takeaway Pay

The task description can be found here. We need to handle payments between customers and restaurants. For this I implemented the transactional method utilizing optimistic locking on updates. And there are also a simple schema and some data that are used both at runtime and in the main test.

Run the application as follows, for instance:

mvn spring-boot:run

Let's now make a payment:

curl -i -X POST localhost:8080/customers/fry/pay \
  -H "Content-Type: application/json" \
  -d '{"restaurant_id": "slurm-dispensing-unit", "amount": 0.25}'

HTTP/1.1 201 
Content-Length: 0
Date: Sun, 09 Jul 2023 16:27:06 GMT

Then check the customer's balance:

curl -i localhost:8080/customers/fry/balance

HTTP/1.1 200 
Content-Type: application/json
Transfer-Encoding: chunked
Date: Sun, 09 Jul 2023 16:28:59 GMT

9.75

The restaurant's balance is now updated as well:

curl -i localhost:8080/restaurants/slurm-dispensing-unit/balance

HTTP/1.1 200 
Content-Type: application/json
Transfer-Encoding: chunked
Date: Sun, 09 Jul 2023 16:30:26 GMT

0.25

Swagger docs are available at http://localhost:8080/api.