```ruby
# encoding: UTF-8

module Dandelionapi
  module Base

    class Request

      protected

      def call(endpoint, params)
        begin
          params = params.merge(
            :token => Dandelionapi.config.token
          )
          conn = Faraday.new(url: Dandelionapi.config.endpoint) do |faraday|
            faraday.request  :url_encoded
            faraday.adapter  Faraday.default_adapter
          end
          response = conn.post "#{Dandelionapi.config.path}#{endpoint}", params
          JSON.parse response.body
        rescue Exception => e
          raise Dandelionapi::BadResponse
        end
      end

    end

  end
end```

Convert Array parameter in string to meet the documentation
user
```ruby
# encoding: UTF-8

module Dandelionapi
  module Base

    class Request

      protected

      def call(endpoint, params)
        begin
          params = params.merge(
            :token => Dandelionapi.config.token
          )
          
          params.each{ |k,v| params[k] = v.join(",") if v.kind_of?(Array) }
          
          conn = Faraday.new(url: Dandelionapi.config.endpoint) do |faraday|
            faraday.request  :url_encoded
            faraday.adapter  Faraday.default_adapter
          end
          response = conn.post "#{Dandelionapi.config.path}#{endpoint}", params
          JSON.parse response.body
        rescue Exception => e
          raise Dandelionapi::BadResponse
        end
      end

    end

  end
end
```
assistant