For ChatGPT
To upgrade to ChatGPT Plus, simply click 'Upgrade to Plus' in the bottom-left corner. You'll then be prompted to select a plan and enter your card details.
If you need to change these details after subscribing, click your name in the bottom-left then select My Plan > Manage my subscription.
For ChatGPT Team, click 'Upgrade to Plus' in the bottom-left corner and select ChatGPT Team instead. Billing management is facilitated through the Billing Info tab on your Workspace Settings page and can only be viewed by Owners.
For the API
In the billing panel, add a payment method (under Payment Methods). After adding a payment method, add credits to your organization by clicking 'Buy credits'.
Under our billing panel, you'll be able to edit your billing details under Preferences and edit your spend limits under Usage Limits.