The security of purchases at S1.ee is ensured by one of the most famous security certificates - Secure Socket Layer (SSL), issued by the GeoTrust certified security center.
When using an SSL certificate, the information sent to the S1.ee server is encrypted from the user's web browser. You can find more information here: https://www.geotrust.com/about/
Make sure you look at the secure page!
On the electronic sheet protected by an SSL certificate, on the left-hand side of the address bar a mark (green lock) is located, which confirms the security of the site. At the online shop S1.ee, an SSL certificate is required to protect the pages where users enter their information: login to a page, "My account" page, shopping cart, order page, etc.
You can find the details of the certificate by pressing the green lock symbol.
S1.ee does not collect the payment system data.
At the S1.ee E-shop, customers connect to the electronic bank or electronic payment systems, their data is transferred to the bank's page, but this data is not available for S1.ee.
About the payment at the webstore S1.ee read here.