Within Teamwork Projects you can update your payment details directly through your site if you have a current subscription for example, if your payment card has been replaced or you need to change to a different card.
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.
To the top right of your Teamwork Site select 'settings' and then choose 'Subscription':
Click the green 'Update Subscription' button below your current plan, and select 'full checkout' from the update modal:
Your current plan details will be set on the subscription page. Just click Select under your current plan.
Once you click select on your current plan, you will be able to update your card details, contact information and billing address:
Note: This will simply update your billing information, unless you have made an adjustment to the plan/users during checkout.
For more information see: Upgrading your Teamwork Projects plan