Because of the PCI Compliance restrictions for saving and storing credit cards as well as the fact that HouseCall does not offer recurring billing, there is currently no option for saving a credit card on file for your customer.
If you need to store the card data yourself, your bar for self-assessment is very high and you may need to have a QSA (Qualified Security Assessor) come onsite and perform an audit to ensure that you have all of the controls in place necessary to meet the PCI DSS specifications.
HouseCall welcomes your suggestions and requests for updated features. If you are in need of this feature for your business, please contact HouseCall through the chat bubble and request your vote be added for this feature. Thank you!