Append Values to List | Fyno Documentation

This API enables you to append values to list type properties of your users listed in your [User Profiles](../user-profiles-overview). If the user with distinct ID doesn't exist, it creates a new user with the provided distinct ID and updates values for all the provided properties. **Note:** If a [property was not created earlier](../adding-new-user-property#how-to-add-a-new-user-property-from-user-profile-page), it will create a new property and the data type of the property will set to `List`. For example, if you `$append` a new property called `order_ids=245`, it will create the `order_ids` property with `List` type and value `[245]`. A list may contain only unique values, so if a value already exists, and you try to add the same value, it will be ignored. You can append values with the following data types:<ul> <li>**String:** Can be alphanumeric and contain a maximum of 255 characters. Example: `products_order=['iPhone 16 Pro', 'iPad 32 GB']`.</li> <li>**Number:** Can be an integer or a decimal. Example: `purchase_amount=[23000, 20.34]`.</li> <li>**Date:** Must be in ISO 8601 format: `YYYY-MM-DDTHH:MM:SS.sssZ`. Example: `membership_date=2020-10-01T18:30:00.000Z` or `membership_date=2020-10-01T18:30:00Z` or `membership_date=2020-10-01T18:30:00.000+05:30` or `membership_date=2020-10-01T18:30:00+02:00` or `membership_date=2020-10-01`.</li> </ul>You can append only one value to a property at a time. Although not recommended, a list property can contain a mix of different data types. These user properties can be used to filter your users for creating [user cohorts](../creating-cohorts) and [campaigns](../campaign_creation#creating-a-campaign-using-cohort).

This API enables you to append values to list type properties of your users listed in your User Profiles. If the user with distinct ID doesn’t exist, it creates a new user with the provided distinct ID and updates values for all the provided properties.

Note: If a property was not created earlier, it will create a new property and the data type of the property will set to List. For example, if you $append a new property called order_ids=245, it will create the order_ids property with List type and value [245]. A list may contain only unique values, so if a value already exists, and you try to add the same value, it will be ignored.

You can append values with the following data types:

String: Can be alphanumeric and contain a maximum of 255 characters. Example: products_order=['iPhone 16 Pro', 'iPad 32 GB'].
Number: Can be an integer or a decimal. Example: purchase_amount=[23000, 20.34].
Date: Must be in ISO 8601 format: YYYY-MM-DDTHH:MM:SS.sssZ. Example: membership_date=2020-10-01T18:30:00.000Z or membership_date=2020-10-01T18:30:00Z or membership_date=2020-10-01T18:30:00.000+05:30 or membership_date=2020-10-01T18:30:00+02:00 or membership_date=2020-10-01.

You can append only one value to a property at a time. Although not recommended, a list property can contain a mix of different data types.

These user properties can be used to filter your users for creating user cohorts and campaigns.

Authentication

AuthorizationBearer

Enter your API Key. If you don't have it already, you can create one from the API Keys page within your Fyno account

Path parameters

WSIDstringRequired

Enter your workspace ID. You can obtain this value from the API Keys page within your Fyno account.

versionenumRequiredDefaults to live

Specify the version for which you would like to update the user property.

Allowed values:

Request

This endpoint expects an object.

$appendmap from strings to doubles or strings or datesRequired

Enter the property name as JSON key and the numeric or string value to append as JSON value

distinct_idstringRequired

Enter the distinct ID that you use to identify the recipient.

Response

Request has been accepted and will be processed asynchronously.

request_idstring

Errors

400

Bad Request Error

401

Unauthorized Error

String: Can be alphanumeric and contain a maximum of 255 characters. Example: products_order=['iPhone 16 Pro', 'iPad 32 GB'].
Number: Can be an integer or a decimal. Example: purchase_amount=[23000, 20.34].
Date: Must be in ISO 8601 format: YYYY-MM-DDTHH:MM:SS.sssZ. Example: membership_date=2020-10-01T18:30:00.000Z or membership_date=2020-10-01T18:30:00Z or membership_date=2020-10-01T18:30:00.000+05:30 or membership_date=2020-10-01T18:30:00+02:00 or membership_date=2020-10-01.