Scheduling Coupon Code/Package

I need some help.

My client runs a yoga business and would like to offer clients a three for one class deal when they sign up for her mailing list. I am having difficulties setting up this within scheduling.

Can anyone offer me some assistance?

I believe this article from the Help center could help you solve the issues for your client. 

Another thing you could do is create a QR code that redirects customers to your coupon code page. You can use a service like a QR code generator of your choice or the interface provided here, and then embed it on your website or in an email. When customers scan the QR code, they'll be redirected to your coupon code page. Generally, I tend to use QR codes whenever possible. 

Hope this helps.