Custom payload won't render

[denis-knizhnik]

Greetings
Currently, i'm writing DF webhook for Viber and Telegram
I use custom payload, but it won't render
For example, for telegram i use
$agent->reply(\Dialogflow\RichMessage\Payload::create(['text'=>"testtext"]));
but it returns an empty message
It renders like
{"payload":{"telegram":{"text":"testtext"}},"outputContexts":[]}
but it seems like Dialogflow doesn't understand it and returns default dialogflow message (as it was set in DF console)
Same for viber
What am i doing wrong, please help