Written for the people at your client, not for you: signing in, tickets, bills, documents, training and who can see what.
The client portal's Billing page: what is outstanding, what each service plan costs and when it next bills, where invoices and quotes live, and how a card on file works.
What a client reader sees on the Security page, and what one security event looks like opened up: the plain sentence, the step we took, and the one button.
One pass through the whole client portal as one of your client's own people sees it: signing in, raising a ticket, closing it, reading a bill, sharing a password and finishing a training.
What your client sees on a ticket: the state strip, the conversation, the reply box, the switch that closes it and the button that opens it again.