There is no secure payments system here at wordpress.COM and you cannot add a shopping cart to sites hosted by wordpress.COM.
E-commerce plugin options have been removed here at WordPress.COM. Secure payment systems are not available here at wordpress.COM. You need a wordpress.ORG install. Please read this https://en.forums.wordpress.com/topic/e-commerce-22?replies=17#post-2575955
Provided you are selling only what you yourself make or a service that you personally provide on a wordpress.COM site you have two options.
(1) PayPal – Know that the only instructions that will work for posting a PayPal donation button on a WordPress.com blog are found here http://en.support.wordpress.com/paypal/
Note that the PayPal email link is not supported and PayPal customization options are not supported either https://en.forums.wordpress.com/topic/paypal-button-41?replies=12#post-2517229 This is not likely to be changed any time soon, if at all.
(2) If you set up an eCommerce site somewhere else online you can create a custom menu http://en.support.wordpress.com/menus/ and include a custom link to that site in it. http://en.support.wordpress.com/menus/#adding-custom-links
Some bloggers create a contact form https://en.support.wordpress.com/contact-form/ on a page and after the people have made a PayPal donation they provide the link to a private page for downloading files. Maybe that will work for you.
If what I provided above at (1) and (2) do not suit you, then this guide will explain how to move your WordPress.com site to another hosting platform: Moving to a Self-Hosted WordPress Site where you can set up a secure payment system https://en.support.wordpress.com/moving-to-a-self-hosted-wordpress-site/
We provide support only for wordpress.COM hosted sites. Our support docs do not apply to
(1) local installs of wordpress.ORG software on your own server or
(2) wordpress.ORG software installs on paid hosting, and we do not provide support for them at wordpress.COM.
Also, note that we do not provide Jetpack support https://jetpack.me/support/ for sites linked to wordpress.COM accounts with the Jetpack plugin so they display on the My Sites wordpress.com account page.
Some Jetpack solutions are here http://jetpack.me/support/
Others are in the Jetpack support forum at WordPress.org
However, if help cannot be found at either one then they can file a Jetpack support ticket here > http://en.support.wordpress.com/contact/?jetpack=needs-service
WordPress.COM and WordPress.ORG are completely separate and have different username accounts, logins, features, run different versions of some themes with the same names, and have separate support documentation and separate support forums. Read the differences here http://en.support.wordpress.com/com-vs-org/
If you don’t have a username account at WordPress.ORG account, then click http://wordpress.org/support/ and register one on the top right-hand corner of the page that opens, https://wordpress.org/support/register.php so you can post to the support forums there.
Resetting your WordPress.ORG password http://codex.wordpress.org/Resetting_Your_Password
WordPress.org support docs are at https://codex.wordpress.org/Main_Page
See also https://apps.wordpress.org/support/
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