# Health Check

To maintain reliability and ensure quality of service, every API, including those provided by the Issuer Bank, is equipped with a health status check. This allows for continuous monitoring and quick response to any service disruptions or issues.

## Health Check API Specification

This document outlines the specification used by Amiko for monitoring the health of services providing the API, based on the [IETF draft on Health Check Response Format for HTTP APIs](https://inadarei.github.io/rfc-healthcheck/).

Mandatory Field

The health check API response includes a single mandatory field and several optional fields to convey the health status of a service.

**Status** indicates the overall health of the service. It must be one of the following:

* `pass`: The service is healthy.
* `fail`: The service is unhealthy.
* `warn`: The service is healthy but with some concerns.

#### Status and HTTP Response Code

* For `pass` and `warn` statuses, the HTTP response code must be in the 2xx-3xx range.
* For `fail` status, the HTTP response code must be in the 4xx-5xx range.
* With a `warn` status, additional information should be provided in optional fields of the response.

### Optional Fields

The specification allows for additional, optional fields to provide more detailed health information, though these are not defined within this summary.

This design ensures that the health of the service can be efficiently monitored and understood through standard HTTP status codes and a simple, yet effective, payload structure.


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