Delete label request returning 400 even though label exists - gmail-api

Question

I am having issues with the label delete Gmail API.
No matter what label I submit, I get the error response:
{
"error": {
"errors": [
{
"domain": "global",
"reason": "invalidArgument",
"message": "Invalid delete request"
}
],
"code": 400,
"message": "Invalid delete request"
}
}
To reproduce, I first make the request:
POST https://www.googleapis.com/gmail/v1/users/me/labels
{"labelListVisibility":"labelShow","messageListVisibility":"show","name":"C2"}
Which succeeds and then immediately after I send:
DELETE https://www.googleapis.com/gmail/v1/users/me/labels/C2
Which produces the aforementioned error. I can see the label in my gmail inbox so I know it is successfully created and present. Any advice on what I am doing wrong?

Answer 1

You cannot delete a label by name, but must do so by its ID
See here. The Id of the label is contained in the response of the
POST https://www.googleapis.com/gmail/v1/users/me/labels
request:
{
"id": "Label_3",
"name": "C1",
"messageListVisibility": "show",
"labelListVisibility": "labelShow"
}
You can also list all you labels to retrieve their IDs.
The delete request should look something like:
DELETE https://www.googleapis.com/gmail/v1/users/me/labels/Label_3
whereby Label_3 should be replaced by your label ID.