WhatsApp messages sent from Rasayel are logged as Activities on the matched Person.The first message creates a new Activity. Messages within 24 hours are added to the same Activity. Messages sent after 24 hours start a new one.
You can build different reports based on logged activity from Rasayel to Pipedrive. You can see how many messages were sent or received and gain insight into who sent them, when they were sent, and what type of messages were used.