Changes to List conversations

added the new optional query request parameter broadcast_id

added the new optional query request parameter replied

added the optional property results/items/replied to the response with the 200 status

added the new payment-timing enum value to the results/items/topic/oneOf[subschema #1: ConversationTopic] response property for the response status 200

added the optional property results/items/broadcast to the response with the 200 status

added the new optional query request parameter participant_id

deleted the header request parameter Authorization

the endpoint scheme security token was added to the API

endpoint added