I would like to add a twitter link/image to invoices that are emailed to customers so when the open email and view invoice on bottom they can click a twitter to follow

Hello flasher,

Thank you for your message.

Some code modifications are required to implement this feature. We would be happy to assist you in this matter within our technical support service. Please contact us via Customer Help Desk if you have support credits or an active support period.

Thank you.

Pavel Zyukin

CS-Cart Support team