metaAds.listMessengerMessages lists recent messages in one Messenger conversation.
automations/meta-ads-list-messenger-messages.automation.ts
limit defaults to and can’t exceed 20. Optional second argument { account } selects a static project account binding.
Returns messages with id, createdTime, from, to, and message for up to the 20 most recent messages. The action needs the same permissions as List Messenger conversations.