MDX v5 Changelog

2025

Month	Date	Products	Description
July	2025.07.17	MDX v5 Real Time	Added: Remap Transaction ID endpoint.
January	2025.01.27	MDX v5 Real Time	Added an optional MX-SKIP-WEBHOOK header to create/update/delete for Holdings, Members, Transactions, and Users.

2024

Month	Date	Products	Description
November	2024.11.08	MDX v5 Real Time	Added support for account_numbers to MDX Real Time.
October	2024.10.12	MDX v5 Real Time MDX v5 On Demand	Added new field federal_insurance_status to the accounts data model.

2023

Month	Date	Products	Description
November	2023.12.13	All products	Added: Overview section clarifying that string values are not encoded.
October	2023.10.23	MDX v5 Real Time MDX v5 On Demand	Changed: The zip_code field on user objects now supports postal codes from the following countries: Canada, Indonesia, Japan, Malaysia, Philippines, South Korea, Thailand, United States, Vietnam.
September	2023.09.27	MDX v5 Real Time MDX v5 On Demand	Added new field category_name to the transactions data model.
August	2023.08.09	MDX v5 Real Time MDX v5 On Demand	Added new fields hold_total and pending_transactions_total to the accounts data model.
	2023.08.04	MDX v5 Real Time MDX v5 On Demand	Added new field running_balance to the transactions data model.
	2023.08.03	MDX v5 Real Time MDX v5 On Demand	Added new fields interest_paid_previous_year, interest_paid_ytd, statement_late_charges, next_payment, principal_balance, daily_deposit_limit_current, daily_deposit_limit_total, monthly_deposit_limit_current and monthly_deposit_limit_total to the accounts data model.

2022

Month	Date	Products	Description
July	2023.07.25	MDX v5 On Demand	Added information about the account_owners data model and associated On Demand endpoint.
	2023.07.12	MDX v5 On Demand	Added information about the account_numbers data model and associated On Demand endpoint.

2021

Month	Date	Products	Description
August	2021.08.11	MDX v5 Real Time MDX v5 On Demand	Updated the definitions for the balance, available_balance, and available_credit fields to conform with those used across all MX documentation.
July	2021.07.14	MDX v5 On Demand	Added support for holdings to MDX On Demand.
April	2021.04.13	MDX v5 Real Time MDX v5 On Demand	Removed the statement_on and statement_at fields; these were replaced with the more clear statement_closed_on field.
February	2021.02.16	MDX v5 Real Time MDX v5 On Demand	Added the cash_advance_apr and statement_on fields.
November	2020.11.10	MDX v5 Real Time MDX v5 On Demand	Updated the format across several data specs to confrom to the latest standards. Added the cash_advance_apr and statement_on fields.

2020

Month	Date	Products	Description
November	2020.11.10	MDX v5 Real Time MDX v5 On Demand	Updated the format across several data specs to confrom to the latest standards. Added the cash_advance_apr and statement_on fields.
	2023.11.10	MDX v5 Real Time MDX v5 On Demand	Added merchant_category_code to the transactions data model. Clarified that values provided in Unix Epoch format must be adjusted by the partner to ensure they are UTC-based.
July	2020.07.23	MDX v5 Real Time	Added documentation on the remap user ID, remap member ID, and remap account ID endpoints.
May	2020.05.04	MDX v5 On Demand	Added a userkey option as a supported response for create session and update session requests.
April	2020.04.16	MDX v5 Real Time MDX v5 On Demand	Added information on new account subtypes.

2019

Month	Date	Products	Description
November	2019.11.14	MDX v5 On Demand	Added clarifying information in the create session and update session endpoint descriptions to describe available MFA workflows.

2018

Month	Date	Products	Description
December	2018.12.19	MDX v5 Real Time	Added a clarification to the versioning section that some fields containing enumerated values, for example account_subtype, may have additional values added from time to time. Partners should be aware of this and plan for it.
November	2018.11.16	MDX v5 Real Time MDX v5 On Demand	Added a clarification in the section on date formats explaining that dates provided in ISO 8601 format must be convertible to Unix epoch time.
	2018.11.09	MDX v5 Real Time MDX v5 On Demand	Added a 'Number Limits' section to outline the precision and scale of decimal numbers. Updated the maximum length values in the field definitions with the correct precision,scale values.
March	2018.03.26	MDX v5 Real Time MDX v5 On Demand	Added the is_internaitonal field to the transactions data model.
	2018.03.02	MDX v5 Real Time	Added a Limitations section which outlines the rate limit that MX applies to each partner's API requests. Error code 429 Too Many Requests was added to the Errors section.