bulk update profile though api

Hi there @MayankShoree,

Welcome to the Community!

The Klaviyo API Identify endpoint only allows for updates of one profile at a time - the idea here would be to use a loop to make multiple calls. This is the method I would recommend using.

Still, if you would like to bulk update profiles, there exists our List API V2, specifically the POST https://a.klaviyo.com/api/v2/list/{LIST_ID}/members endpoint

This endpoint is meant to add profiles to a list without subscribing them - but we can use the same endpoint to update properties for profiles that may already exist in the list.

For example, in a test list of mine I had cstestklaviyo@gmail.com and cstestklaviyo@outlook.com as members. Yet, I could make the following call to add "test_property" as a property with values of "valueA" and "valueB" respectively:

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This led to the property being created on the profile:

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If the property already exists, this endpoint will update the value as well.

Hope that helped,

Alex