Please note that if your client has not provided you with access to their subscription, then you will not be able to update their card details. You can either request your client to provide you access or you can update the card details to the agent paying for the subscription.
Updating the client's credit card details for clients who have provided agent access to their subscription
Select the three dots on the right side of the client card
Select Billing
Select Update Card details
Make sure "client pays" is indicated, and select "Enter card details on behalf of the client"
Enter the new card details and select "Confirm"
Updating credit card details to the agent, for clients who have not provided access to their subscription
Select the three dots on the right side of the client card
Select Billing
Select Update Card details
Select Agent Pays
Enter the card details, check that you are subscribing for the correct amount and subscription type, and select confirm.
Updating card details for agents who are paying for the client's subscription with their agent card.
There are two ways to update the agent credit card