Update user profile key using REST API in freemarker

Hi,

I need to update a user profile key in my custom endpoint.

I know the REST API to be used here:

/users/id/${user_id}/profiles/name/${key}/set?value=${value}

But I am not able to post this request using following code:

<#assign updateKey = restadmin("/users/id/${user_id}/profiles/name/${key}/set?value=${value}") />

Any help would be appreciated.

Thanks,

Madhu