public CustomFields updateCustomField(String accountId, String customFieldId, CustomField customField) throws ApiException {
    return updateCustomField(accountId, customFieldId, customField, null);
  }
public CustomFields updateCustomField ( String accountId , String customFieldId , CustomField customField ) throws ApiException { return updateCustomField ( accountId , customFieldId , customField , null ) ; }
Updates an existing account custom field.

@param accountId The external account number (int) or account ID Guid. (required)
@param customFieldId  (required)
@param customField  (optional)
@return CustomFields