How can I update a custom sticker on a card on Trello using the Trello API?

Question

After posting a custom sticker on a card, I followed the documentation and it says that the endpoint to update it should be:

curl --request PUT \
  --url 'https://api.trello.com/1/cards/{id}/stickers/{idSticker}?top={top}&left={left}&zIndex={zIndex}&key=APIKey&token=APIToken'

In order to get the {{idSticker}} I need, I sent beforehand a GET request on Tests section:

// get idSticker from response
const idSticker = jsonResponse[0].id;

I get and ID, which corresponds with the custom sticker I want to update. I checked that hardcoding the ID that I got and sending a new POST request. It's the same sticker.

{{base_url}}/1/cards/{{card_id}}/stickers/{{custom_sticker_id}}?top=10&left=0&zIndex=0&key={{key}}&token={{token}}

and I get the response "Invalid idSticker".

What Am I doing wrong? Thanks!