How to make the cover of a trello card a players image?

I’ve been trying to make the cover of a trellos card the icon of the player. I’ve got no clue on how to do it. I’ve tried with GetUserThumbnailAsync but that didn’t work.

How would I do this?

You need to make an API call to retrieve the data. Relevant page:
https://thumbnails.roblox.com/docs/index.html
There are a number of choices of avatar image to return.

For example:

curl -X 'GET' \
  'https://thumbnails.roblox.com/v1/users/avatar-3d?userId=1688252759' \
  -H 'accept: application/json'

or

https://thumbnails.roblox.com/v1/users/avatar-3d?userId=1688252759

Will both return my avatar image, but are called by different methods