Add a payment method under Default payment method
Add payment method button on the next screen
Add payment method screen, click Add a credit or debit card
Add your card
Use this address
Finish button on the next screen
Back to {Name of your group}
Purchasing System under System integrations
Add default under Default payment method
Add under the Payment method section
Save
Edit button
Back to {Name of your group} and navigate to Purchasing SystemPayment Method should now look something like this
Switch to Active mode button on the right side of the page
Switch to Active mode in the modal
Active