curl --location --request POST '/api/v1/users/register' \
--header 'Content-Type: application/json' \
--data-raw '{
"userName": "string",
"email": "user@example.com",
"password": "pa$$word"
}'
{
"userId": 0,
"userName": "string",
"email": "user@example.com",
"tierCode": "FREE",
"createdAt": "2019-08-24T14:15:22Z",
"lastLoginAt": "2019-08-24T14:15:22Z"
}