Client Payments The makemyworkout system comes enabled with payment capability from 2checkout.com. 2checkout.com is one of the leading companies involved in online payment services. It is secure and easy to use. All you need is a 2checkout.com account number. Once you have that account number, just send it to us, we will add it to your system and you are ready to go. Signing up for 2checkout.com takes only a few mins, so within a day you are ready to go. You can start signing up clients on your web site.