205 CMR, § 6.24
Deposits may be made in person or by mail, in cash or by check or negotiable order of withdrawal. The proceeds of a check may first need banker's clearance. Holding periods will be determined by the association and advised to the account holder. An individual who has established a betting account with a racing meeting licensee may deposit money into said account through the use of a credit card or debit card issued by a federal or state-chartered bank and a racing meeting licensee may collect and deposit money received in such a manner at the licensee's racetrack or through the telephone, internet or other telecommunications media. No credit shall be extended to a betting account by a running horse, harness horse or dog racing meeting licensee. A receipt for the deposit must be issued to the account holder, but does not need to reflect the current account balance.
205 CMR, § 6.24