> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mx.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Member Fields

> Member fields for the MDX Real Time API.

## Member Fields

| Field Name       | Data Type | Description                                                                                      |
| ---------------- | --------- | ------------------------------------------------------------------------------------------------ |
| `guid`           | `String`  | Unique identifier for the member. Defined by MX.                                                 |
| `id`             | `String`  | Partner-defined unique member identifier. Must not start with `MBR-`. Max length 1024.           |
| `institution_id` | `String`  | Client-specific ID used to select alternate institutions in create member requests. Rarely used. |
| `is_disabled`    | `Boolean` | Indicates whether the member is disabled. Defaults to false. Disables aggregation when true.     |
| `login`          | `String`  | Login credential used with password for authentication (alternative to userkey).                 |
| `metadata`       | `String`  | Additional partner-defined metadata.                                                             |
| `name`           | `String`  | Member name. Defaults to institution name if not provided. Max length 100. Rarely used.          |
| `password`       | `String`  | Password credential used with login (alternative to userkey).                                    |
| `user_guid`      | `String`  | MX-defined user identifier for this member.                                                      |
| `user_id`        | `String`  | Partner-defined user identifier for this member.                                                 |
| `userkey`        | `String`  | Authentication key used for MDX On Demand requests. Preferred over login/password.               |