2xx range indicate success. Codes in the 4xx range indicate a problem with your request, such as a missing parameter or invalid bank credentials. Codes in the 5xx range indicate an error from Fintoc or the financial institution.2xx range indicate success. Codes in the 4xx range indicate a problem with your request, such as a missing parameter or invalid bank credentials. Codes in the 5xx range indicate an error from Fintoc or the financial institution.