To enable credit card payments, please go through the verification process that you will find on the Profile tab on the platform. After clicking on "Profile" go ahead and click on "Verification", then follow the instructions.
Do not worry! Your identity is not exposed to your Collectors (or anyone else on the platform) and your verification data is only communicated to and stored in Onfido's secure server. When you enter your First and Last Name on the Fair.xyz UI, that data is being stored solely on your local machine, and not on our servers (you can check this by accessing the same tab on another device!).
When the verification process is done, credit card payments will be automatically enabled for all your collections. So there's nothing else you need to do on your end!