Credits allow to directly increase or decrease employee's salary for particular settlement period (eg. for piece work)
{
"id": "497f6eca-6276-4993-bfeb-53cbbbba6f08",
"employee_id": "df4fd699-0854-488d-9cc2-15e751a80ee3",
"timestamp": "2019-08-24T14:15:22Z",
"amount": "string",
"currency": "string",
"title": "string",
"unique_identifier": "string"
}