pay-ledger

This is a bare bones Dropwizard App for the Pay Ledger microservice.

Environment variables

There are several environment variables used for the app configuration. They're grouped in categories: database, SQS and background processing.

Database configuration

SQS configuration

Background processing configuration

The background receiver will process all events that have been published to the SQS queue (AWS_SQS_PAYMENT_EVENT_QUEUE_URL).

A background thread managed by Dropwizard runs on all connector nodes. It polls the SQS payment event queue to retrieve the list of events. Processing each event involves adding a record to Event database table (unless the event is a duplicate of an event already processed, then the event is ignored).

If processing event fails it will be retried again after a specified delay (QUEUE_MESSAGE_RETRY_DELAY_IN_SECONDS). It is achieved by setting up the visibility timeout with the delay value which prevents consumers from receiving the message. After this timeout the message becomes visible for consumers again. More information of how the visibility timeout works can be found here.

The following variables control the background process:

Licence

MIT License

Responsible Disclosure

GOV.UK Pay aims to stay secure for everyone. If you are a security researcher and have discovered a security vulnerability in this code, we appreciate your help in disclosing it to us in a responsible manner. We will give appropriate credit to those reporting confirmed issues. Please e-mail [email protected] with details of any issue you find, we aim to reply quickly.