Zelle offers an account-to-account payment option and no service fee. This option is available to anyone with an account at a bank in the United States.

Venmo offers either an account-to-account option without a service fee or a credit card-to-account option with a small service fee, which Dr. K will cover for you. This option is available to anyone with an account at a bank in the United States.

Paypal Business offers a credit card-to-account option which incurs a small service fee, which Dr. K will cover for you. This option is available to anyone, including international clients who may not have a bank account in the United States.