It is possible to save credit card information in Payments OS.
You can save the tokenized credit card number by associating it with a corresponding customer resource. Please note that CVV information cannot be saved.
You will need to check if the provider you would like to use approved the use of "Stored Credentials Flag". If the provider does not support this option, you will not be able to use the feature and save the customer credit card information. You will find this information under the features section in each of the providers' integration documentation.
For example, Payeezy allows sending "Stored Credentials Flag".
For more information and details, see the below articles:
1. Reusing card information
2. Collecting CVV code
3. Follow the specific guides for every provider