Within Teamwork Projects you can update your payment details at any time, directly through your site, if you have an active subscription.
If you need to change or add a tax number, you can follow this information also.
Note: Only site administrators in the owner company have access to this area.
Click your profile icon in the top right corner of your site, and select Subscription from the dropdown menu.
In the Subscription area, you will see an option to update your payment details, below your plan summary.
You will then be able to put in your updated payment information, as well as contact details and any changes in billing address.
For some older subscription plans, the steps to update differ.
In the Subscription area, you will see a summary of the current plan you are on, at the top of the page.
Below the summary is a breakdown of your current plan, as well as the other plans available to you.
At the bottom of your current plan, you will see a link to Update Payment Details.
This will bring you to the payment details page where you can update your card.
For more information see: Upgrading your Teamwork Projects plan