I'm using dillenmeister's Trello.Net API wrapper, and I see that removing an attachment from a card was added a couple months ago, but the call that I'm using (Trello.Cards.RemoveAttachment()) calls for a CardId and an IAttachmentId. I've figured out how to create a CardId (new CardID(Card.ID)), but I'm not seeing how to create the IAttachmentID that it's looking for.
I have the attachment object, and can get the ID from there, but that is of type string.