The Child Maintenance and Enforcement Commission is responsible for the child maintenance system. I have asked the Child Maintenance Commissioner to write to the hon. Member with the information requested and I have seen the response.
Letter from Stephen Geraghty:
In reply to your recent Parliamentary Question about the Child Support Agency, the Secretary of State promised a substantive reply from the Child Maintenance Commissioner as the Child Support Agency is now the responsibility of the Child Maintenance and Enforcement Commission.
You asked the Secretary of State for Work and Pensions, how many individuals paid off their arrears to the Child Support Agency by credit card in each of the last three years. 
Data on child maintenance arrears payments made only by credit card is not available as it is not possible to separate regular and arrears payments and it is not possible to break down payments made by credit or debit card.
I am sorry on this occasion I can not be more helpful.