curl --request POST \
  --url https://payments.oaknetwork.org/api/auth/signin \
  --header 'Content-Type: application/json' \
  --data '
{
  "email": "user@example.com",
  "password": "SecurePass123!",
  "role": "ROLE_PLATFORM_ADMIN"
}
'

{
  "msg": "Sign In Successful!",
  "data": {
    "id": 123,
    "email": "jsmith@example.com",
    "accessToken": "<string>",
    "refreshToken": "<string>",
    "createdMillis": 123
  }
}