In addition to accepting credit card payments online at our website, DOR now accepts child support payments by credit card over the phone or in person in any of our regional offices. DOR accepts MasterCard, Visa, Discover, and American Express. To make a payment by phone, call 1-800-332-2733 or, in Greater Boston, call 617-660-1234. A convenience fee of 2.30% charged by the credit card processing company is added to each credit card payment made over the phone or in an office. For example, if a parent calls us to charge a child support payment of $200 to a credit card, a $4.60 convenience fee will be added so a total of $204.60 will be charged to the credit card. Read more