With Karmasoft you can add buy now links to your website or emails.
Creating Buy Now Links
To generate a shopping cart URL for buy now link:
From the dashboard, click [Assets] and Products.
From the product screen, click on the product you'd like to sell online.
Note: make sure the sell online box is checked on this product. If it's not, check it now. Then click save, and re-open your product screen.
Copy your shopping cart URL.
Paste the shopping cart URL within an HTML link: