class Doorkeeper::OAuth::ClientCredentialsRequest::Creator

def call(client, scopes, attributes = {})
  existing_token = existing_token_for(client, scopes)
  if Doorkeeper.configuration.reuse_access_token && existing_token&.reusable?
    return existing_token
  end
  existing_token&.revoke
  AccessToken.find_or_create_for(
    client, nil, scopes, attributes[:expires_in],
    attributes[:use_refresh_token]
  )
end

def existing_token_for(client, scopes)
  Doorkeeper::AccessToken.matching_token_for client, nil, scopes
end