```ruby Sendyr.configure do |c| c.url = 'https://sendy.mydomain.com' c.api_key = 'xxxxxx' end ``` ``` @status=200 @reason_phrase="OK" @response_body="API key not passed" ``` had to specify it: ```ruby sendyr_client.subscribe(email: email, api_key: Sendyr.configuration.api_key) ```