Pay for a session or consultation by credit card (via e-mail invoice) Randall Dean Consulting & Training, LLC, has the capability to send e-mail invoices to current clients, so they can pay via credit card through a secure e-commerce web site. The limit for any particular transaction at this time is $500, thus requiring any invoice amounts greater than $500 to be billed in multiple increments. We are in the process of getting our maximum transaction levels increased so that we can make this option even more convenient for our clients. Watch for more information on this option soon. To request billing via e-mail invoice for payment by credit card, simply e-mail your request to us, or just call us at 517-336-8906.