Rename App Variable

curl --request PATCH \
  --url https://api.example.com/apps/{app_id}/variables/{key} \
  --header 'Content-Type: application/json' \
  --data '
{
  "key": "<string>",
  "value": "<string>",
  "secret": true
}
'

{
  "key": "<string>",
  "value": "<string>",
  "secret": true
}