Update a key's remaining limit

curl --request POST \
  --url https://api.unkey.dev/v1/keys.updateRemaining \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "keyId": "key_123",
  "op": "increment",
  "value": 1
}'

{
  "remaining": 100
}