How to buld: mvn clean package or with skipping tests mvn clean package -Dmaven.test.skip=true
How to run: java -jar ./target/tst1-1.0-SNAPSHOT.jar Wait for message in log "Money transfer server started" (about 5 seconds).
How to shutdown: curl -XGET localhost:8080/v1/quit (for ease of use during testing)

It's just a test server.
Try to get localhost:8080/v1/transactions?accountId=11&page=0&offset=10
or localhost:8080/v1/transactions?cusTOmeRId=1&page=1&offset=2
or localhost:8080/v1/transactions/1003
or localhost:8080/v1/transactions?page=0&offset=20 for example.
Available endpoints:

• /v1/transactions (GET, POST)
• /v1/transactions/{id} (GET)
• /v1/customers (GET)
• /v1/customers/{id} (GET)
• /v1/accounts (GET)
• /v1/accounts/{id} (GET)
• /v1/rates (GET, POST)
• /v1/rates/{id} (GET)

So at present there is no possibility to update or delete any entity and add customer or account.
You can only

• get entities
• add a new transaction using POST request to /v1/transactions with body like this:

{
  "accountFromId": 11,
  "customerToId": 3,
  "amountFrom": 100000,
  "currencyTo": "USD"
}

• add a new exchange rate using POST request to /v1/rates with body like this:

{
  "currencyFrom": "EUR",
  "currencyTo": "BTC",
  "rate": "0.00018623",
  "validFrom": "2018-09-12T13:00:00",
  "validTo": "2018-09-30T15:00:00"
}

Time zone is UTC.
ValidFrom must be null (recognized as NOW()) or >= NOW().
If validTo is not null it must be greater than validFrom.

For available ids for customers, accounts, rates and transactions see a request from corresponding GET v1/... endpoint.
Available currencies: USD, EUR, GBP, BTC
Available exchange rates for USD <-> EUR and USD <-> BTC operations

There are some tests:
2 unit tests: MoneyTransferServiceTest and MoneyTransferRepositoryTest
1 integration test with logging of requests and (in some cases) responses: Tst1IntegrationTest