Autthenticated Access to S3 - Unable to retrieve attachments

I read the following article.

According to this article, when we throw a request like

curl https://api.trello.com/1/cards/{idCard}/attachments/?fields=url&key={{apiKey} 14}&token={{apiToken}}

we are supposed to receive a response with a signature parameter, such as

[{
  "id": "5ef22a288dcee602857a9990",
  "url": "https://api.trello.com/1/cards/5edfa37673e537161016361c/attachments/5ef22a288dcee602857a9990/download/Screen_Shot_2020-06- 23_at_11.13.18_AM.png?signature=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJuYmYiOjE1OTM0NTcyMDAsImV4cCI6MTU5MzQ2Mj YwMCwicmVzIjoiNWVkZmEzNzY3M2U1MzcxNjEwMTYzNjFjOjVlZjIyYTI4OGRjZWU2MDI4NTdhOTk5MCIsImlhdCI6MTU5MzQ1OTkwNSwiYXVkIjoiVHJlb GxvIiwiaXNzIjoiVHJlbGxvIn0.8YcOCOFZ4rURYWoiYYEhAEeyQJyMcnSBRo83UviTA_k"
}]

However, when I throw a request, I get a response with no Signature parameter. In other words, I get a response like the following

[{
  "id": "5ef22a288dcee602857a9990",
  "url": "https://api.trello.com/1/cards/5edfa37673e537161016361c/attachments/5ef22a288dcee602857a9990/download/Screen_Shot_2020-06-23_at_11.13.18_AM.png"
}]

This does not allow me to retrieve attachments via the API. What should I do?

Hi @DaikiAkimoto and welcome! This particular topic has caused some confusion. Especially with the two separate posts regarding this update.

Basically, what you’re looking for is the update below stating that you will now need to pass your key and token in the authorization header via OAuth1.0 methods.